MURPHY, Circuit Judge.

I. Introduction

Plaintiff David Brown brings this appeal from the dismissal of his action challenging his ban from using public transportation provided by the Metropolitan Tulsa Transit Authority (the "MTTA"). Brown asserted claims arising under the United States Constitution, federal civil rights laws, and Oklahoma state law. The district court granted summary judgment pursuant to Fed. R. Civ. P. 56(a) in favor of the MTTA as well as defendants J.D. Eppler, Ray Willard, Jane Doe, and Janet Doe (collectively "employee defendants"). In so doing, the court concluded Brown did not have a constitutionally protected property interest in access to MTTA services.

Additionally, Brown has moved before this court to proceed in forma pauperis. Brown was not incarcerated when he initiated suit in federal court. He was incarcerated, however, when he filed his notice of appeal. During the pendency of this appeal, Brown has been released from prison. Brown's ifp motion therefore requires this court to determine the scope of the Prisoner Litigation Reform Act ("PLRA") and its applicability to these unusual factual and procedural circumstances.

Exercising jurisdiction pursuant to 28 U.S.C. § 1291, this court reverses the district court's grant of summary judgment to The MTTA on Brown's procedural due process claims and affirms the judgment of the district court in all other respects. Brown's motion to proceed ifp is granted.

II. Background

Brown is a resident of Tulsa, Oklahoma. The employee defendants work for the MTTA. The attorney defendants are counsel for the MTTA and the employee defendants. The MTTA is a trust created under Tulsa City Ordinance Title 39, Ch. 9. See Okla. Stat. tit. 60 § 176-80 (setting forth rules governing municipal trusts in Oklahoma.) The incidents underlying Brown's dispute with the MTTA were aptly summarized by the district court:

Brown v. Eppler, 788 F.Supp.2d 1261, 1264-66 (N.D.Okla.2011).

Brown brought suit in Oklahoma state court against the MTTA and employee defendants. After his state court suit was dismissed without prejudice due to lack of jurisdiction, Brown filed the present federal action in the Northern District of Oklahoma, re-asserting his causes of action against the employee defendants and adding a cause of action against the attorney defendants for conspiracy to violate his constitutional rights by having his state court action improperly dismissed. The district court dismissed the claims against the attorney defendants under Fed. R.Civ.P. 12(b)(6). The MTTA and employee defendants moved for summary judgment on Brown's remaining claims. Brown moved for partial summary judgment on liability for his procedural due process claim against the MTTA. He also moved to cite and sanction defendants Eppler and Willard for aggravated perjury and, separately, sought sanctions under Fed.R.Civ.P. 11. The district court granted the defendants' motion for summary judgment and denied Brown's motion for summary judgment as well as his motions for sanctions against Eppler and Willard. This appeal followed.

III. Discussion

A. Procedural Due Process Claim

This court reviews a grant of summary judgment de novo, applying the same standard as the district court. Taylor v. Roswell Indep. Sch. Dist., 713 F.3d 25, 34 (10th Cir.2013). Summary judgment is appropriate "if the movant shows that there is no genuine dispute as to any material fact and the movant is entitled to judgment as a matter of law." Fed. R.Civ.P. 56(a). The district court granted summary judgment in favor of the MTTA and employee defendants on Brown's procedural due process claims because it concluded Brown did not have a protected property interest in access to MTTA public transportation. "Procedural due process guarantees apply only to those liberty and property interests encompassed by the fourteenth amendment." Jacobs, Visconsi & Jacobs, Co. v. City of Lawrence, 927 F.2d 1111, 1115 (10th Cir.1991). "To have a property interest in a benefit, a person clearly must have more than an abstract need or desire for it. He must have more than a unilateral expectation of it. He must, instead, have a legitimate claim of entitlement to it." Bd. of Regents v. Roth, 408 U.S. 564, 577, 92 S.Ct. 2701, 33 L.Ed.2d 548 (1972). Protected property interests "are created and their dimensions are defined by existing rules or understandings that stem from an independent source such as state law." Id.; see also Carnes v. Parker, 922 F.2d 1506, 1509 (10th Cir.1991) ("Property interests ... are created by independent sources such as a state or federal statute, a municipal charter or ordinance, or an implied or express contract."). "When analyzing whether a plaintiff presents a legitimate claim of entitlement, we focus on the degree of discretion given the decisionmaker and not on the probability of the decision's favorable outcome." Jacobs, 927 F.2d at 1116.

As both parties acknowledge, The MTTA is a common carrier under Oklahoma law. See Okla. Stat. tit. 13 § 4 ("Everyone who offers to the public to carry persons, property or messages is a common carrier of whatever he thus offers to carry."). The district court analyzed Oklahoma's common carrier statute to determine whether Brown had a protected property interest in access to MTTA buses. See Okla. Stat. tit. 13 § 5 ("A common carrier must, if able to do so, accept and carry whatever is offered to him, at a reasonable time and place, of a kind that he undertakes or is accustomed to carry."); id. § 43 ("A common carrier of persons may make rules for the conduct of his business, and may require passengers to conform to them, if they are lawful, public, uniform in their application, and reasonable."); id. § 45 ("A passenger who refuses to pay his fare, or to conform to any lawful regulation of the carrier, may be ejected from the vehicle by the carrier."). The court confined its inquiry to determining "the degree to which the state has restrained the discretion that MTTA has to provide the benefit of its services." Brown, 788 F.Supp.2d at 1269. The district court concluded Oklahoma law places no significant restraints on the MTTA's ability to alter its rules of conduct for its passengers, so long as such rules are reasonable. Id. at 1271; see also Chicago R.I. & P. Ry. Co. v. Armstrong, 30 Okla. 134, 120 P. 952, 954 (1911) ("While it may be said that by opening the doors to its depots, the company gives an implied license to any and all persons to enter, it may be answered that by so doing, it prima facie gives an implied license, but such license is revocable in its nature, and, if actually revoked and due notice given to an individual ... and [he] still persist[s] in entering without a license, the owner has the right to exclude [him] by force, if necessary."). The district court deemed irrelevant the question whether the MTTA's then-existing rules of conduct may have limited its discretion to exclude passengers from its service because the MTTA had the discretion to change such rules at any time. Brown, 788 F.Supp.2d at 1271.

We conclude the district court's analysis was in error. By focusing on the degree of discretion afforded to the MTTA to make rules governing access to its services, the district court overlooked the possibility the MTTA had constrained its own discretion to deny service to a sufficient extent as to give rise to a "legitimate claim of entitlement" to service. Under the district court's interpretation of the Due Process Clause, it mattered not whether Brown actually violated the MTTA's rules of conduct because, even if he had not, the rules could always be changed. This approach is inconsistent with Supreme Court and Tenth Circuit precedent, which, when analyzing whether a protected interest exists, focuses on whether there are "specific directives to the decisionmaker that if the regulations' substantive predicates are present, a particular outcome must follow." Ky. Dep't of Corrs. v. Thompson, 490 U.S. 454, 463, 109 S.Ct. 1904, 104 L.Ed.2d 506 (1989) (emphasis added); Greenholtz v. Inmates of Neb. Penal & Corr. Complex, 442 U.S. 1, 11-12, 99 S.Ct. 2100, 60 L.Ed.2d 668 (1979) (recognizing protected interest in parole because of mandatory constraints on Board of Parole); Hyde Park Co. v. Santa Fe City Council, 226 F.3d 1207, 1210 (10th Cir.2000) ("[A] right to a particular decision reached by applying rules to facts constitutes `property.'").

Analyzed under the appropriate analytical framework, whether Brown has a protected property interest in continued access to MTTA public transportation depends upon whether the MTTA's rules sufficiently constrain its own discretion to deny service in any particular instance. We conclude they do. The MTTA publishes a set of "Transit Policies" along with its quarterly route guides for MTTA customers. The transit policies provide that "the Coach Operator or other Tulsa Transit Staff will enforce the rules outlined here on Tulsa Transit's properties," and that "[b]y violating any of these policies [a rider] may be banned from Tulsa Transit." Further, in an affidavit submitted to the district court as part of the summary judgment record, Willard attested that the ban on Brown's future use of MTTA buses was made "pursuant to MTTA's published and written rules against any fighting, throwing of any objects, pushing, rough or loud behavior or vulgar language and pursuant to MTTA's policy to ensure that their customers have a safe and enjoyable ride." Because the MTTA has limited its own discretion to ban riders to a set of clearly defined circumstances, Brown has a "legitimate claim of entitlement" to access to MTTA transportation so long as he complies with its rules and regulations, and, hence, a protected property interest under the Due Process Clause of the Fourteenth Amendment.1

Because the district court concluded Brown did not have a protected property interest in access to MTTA public transportation, it did not reach the issue whether sufficient process accompanied the deprivation. See Am. Mfrs. Mut. Ins. Co. v. Sullivan, 526 U.S. 40, 59, 119 S.Ct. 977, 143 L.Ed.2d 130 (1999) ("Only after finding the deprivation of a protected interest do we look to see if the State's procedures comport with due process."); Fed. Lands Legal Consortium ex. rel Robart Estate v. United States, 195 F.3d 1190, 1195-96 (10th Cir.1999). We leave that issue open to the district court on remand.

B. Remaining Claims on Appeal

Brown presents seven arguments on appeal in addition to those discussed above.2 Having carefully reviewed the record and the arguments of the parties, and applying the appropriate standards of review,3 we conclude Brown's remaining contentions are so lacking in merit that we summarily affirm the dismissal of his remaining claims and denial of his motions for sanctions.4

C. In Forma Pauperis Status5

Along with his pro se complaint filed in federal court on July 17, 2009, Brown moved to proceed in forma pauperis and attached a supporting financial affidavit. The district court granted the motion. Brown was not incarcerated at the time he filed his complaint and initial ifp petition. Brown was incarcerated, however, when he filed his notice of appeal. Thus, after filing his notice of appeal, Brown filed a renewed motion to proceed ifp and an application to pay his appellate filing fees in monthly, twenty-dollar installments. See Fed. R.App. P. 24(a)(3)(B) ("A party who was permitted to proceed in forma pauperis in the district-court action... may proceed on appeal in forma pauperis without further authorization, unless... a statute provides otherwise."); 28 U.S.C. § 1915(a)(2). The district court denied the motion as moot, concluding Fed. R.App. P. 24(a)(3) permitted Brown to proceed ifp on appeal without further authorization. Brown has subsequently moved in this court for leave to proceed without prepayment of costs and fees. During the pendency of this appeal, Brown was released from prison.

Applications to proceed ifp are governed by 28 U.S.C. § 1915. The main ifp provision, § 1915(a)(1), provides:

The PLRA amended § 1915 to add provisions applicable to prison litigants. 28 U.S.C. § 1915(a)(2) provides:

28 U.S.C. § 1915(b) further clarifies the scope of the PLRA's payment and filing fee requirements, providing:

This court must therefore determine whether the provisions of the PLRA apply to a litigant, like Brown, who was not incarcerated when he initiated a civil action but was incarcerated when he filed his notice of appeal. We conclude they do.

"When interpreting the language of a statute, the starting point is always the language of the statute itself. If the language is clear and unambiguous, the plain meaning of the statute controls." United States v. Quarrell, 310 F.3d 664, 669 (10th Cir.2002) (citation omitted). Here, two provisions of the PLRA define the scope of its applicability. Section 1915(a)(2) applies to "[a] prisoner seeking to bring a civil action or appeal a judgment in a civil action or proceeding without prepayment of fees or security therefor." (emphasis added). Section 1915(b)(1) applies "if a prisoner brings a civil action or files an appeal in forma pauperis." (emphasis added). Brown was indisputably a "prisoner" within the meaning of the PLRA at the time he noticed his appeal. See 28 U.S.C. § 1915(h) ("As used in this section, the term `prisoner' means any person incarcerated or detained in any facility who is accused of, convicted of, sentenced for, or adjudicated delinquent for, violations of criminal law or the terms and conditions of parole, probation, pretrial release, or diversionary program."). Because Brown sought to "appeal a judgment in a civil action," and "file an appeal in forma pauperis" while he was a prisoner, the plain terms of 28 U.S.C. §§ 1915(a)(2) and (b)(1) dictate the district court erred in excusing him from the compliance with the PLRA.

Brown argues the phrase "appeal a judgment in a civil action" in § 1915(a)(2) refers back to the "civil action" brought by the prisoner. Thus, he argues, the PLRA merely creates two separate assessment points designed to deter frivolous prisoner litigation. This argument is not persuasive. Brown's reading of § 1915(a)(2) cannot be squared with the language of § 1915(b)(1), which does not use the phrase "a civil action" and applies to any prisoner who "file[s] an appeal in forma pauperis." Seeking to get around this problem, Brown argues the fee payment provision — § 1915(b)(1) — and the trust account disclosure provision- § 1915(a)(2) must be read consistently with each other because one cannot apply without the other. In other words, without the disclosure of a trust account, the court cannot make the required assessments to collect the filing fee. While true, this argument just as validly justifies reading § 1915(a)(2) consistently with § 1915(b)(1) as the contrary reading preferred by Brown. Because the language of § 1915(b)(1) is not susceptible to any of the possible ambiguities inherent in § 1915(a)(2), reading the two provisions in harmony compels the conclusion that the PLRA applies to any prisoner who brings an appeal and seeks ifp status, regardless of whether the underlying district court action was filed before the prisoner was incarcerated.

The terms of the statute also dictate the scope of Brown's payment obligation under the PLRA.7 28 U.S.C. § 1915(b)(1) provides that "if a prisoner brings a civil action or files an appeal in forma pauperis, the prisoner shall be required to pay the full amount of a filing fee." This obligation, however, applies to both prisoner and non-prisoner ifp litigants. See Robbins v. Switzer, 104 F.3d 895, 898 (7th Cir.1997) ("Section 1915(b)(1) says that prisoners are liable for the full fees, but so is every other person who proceeds in forma pauperis; all § 1915(a) does for any litigant is excuse the pre-payment of fees. Unsuccessful litigants are liable for fees and costs and must pay when they are able."). Unlike non-prisoner ifp litigants, prisoners, while incarcerated, are required to make payments according to the scheme set forth in § 1915(b). Thus, Brown should have paid an initial partial appellate filing fee calculated according to the formula set forth in 28 U.S.C. § 1915(b)(1). While he was incarcerated, he should have also paid additional amounts calculated pursuant to § 1915(b)(2) on the basis of his monthly income from the time he filed his notice of appeal to the time of his release from incarceration.

Neither of these sums have been paid and, thus, constitute an outstanding obligation. We note, however, that Brown's failure to make the payments is not due to any bad-faith conduct on his part. To the contrary, shortly after filing his notice of appeal, Brown moved to make payments of the appellate filing fee in monthly, twenty-dollar installments and provided the required trust account information to the district court. Brown also provided the relevant trust account information to this court in conjunction with his motion to proceed ifp. In light of the unusual circumstances of this matter, on remand the district court should exercise its discretion to determine the amount of the outstanding fee obligation, i.e., the amount which should have been assessed under § 1915(b) prior to Brown's release from prison, and terms pursuant to which Brown may pay it.

III. Conclusion

For the foregoing reasons, the judgment of the district court dismissing Brown's procedural due process claim is reversed. The judgment of the district court is affirmed in all other respects, and the matter is remanded for further proceedings not inconsistent with this opinion. Brown's motion for leave to proceed in forma pauperis before this court is granted, but he is obligated to make payments toward the appellate filing fee as determined by the district court. Further, like any ifp litigant, he remains liable for the full amount of the filing fee.