Petitioner, The Flying Tiger Line, an air carrier licensed for scheduled movement of air freight, seeks review of Civil Aeronautics Board Order No. E 20990, which dismissed without a hearing its complaint against a tariff filed by Pan American World Airways. The challenged tariff sets forth special low rates limited to military stores and impedimenta moving under United States Government bills of lading for the Department of Defense; it deals with air freight transportation chiefly to Asia, Africa and Europe.

Pan American is a combination carrier licensed for both freight and passenger carriage; Flying Tiger carries freight only and in the past has carried air cargo for Military Air Transport Service (MATS) at the lowest rates permitted by the Board. The operations of the Defense Department are of such magnitude that it is the largest single shipper in foreign air transport. Necessarily, the allocation of this carriage among available carriers has an important impact on the civil air transport system. The Board does not have direct statutory power to fix rates in foreign carriage as it does in interstate transportation and to territories and possessions of the United States. Section 1002(f) of the Act, 72 STAT. 789, 49 U.S.C. § 1482(f), gives it power over foreign rates applicable only "to the extent necessary to correct [unjust or undue] discrimination, preference, or prejudice" which is disclosed after hearing and notice before the Board.

Even without direct rate making power the Board has exercised significant indirect control over foreign rates under its veto power over rates fixed under procedures of International Air Transport Association. Another source of such control is the power to fix minimum rates for military carriage which are not governed by Association established rates; this is done by making such minimum rates a condition of the operating authority granted pursuant to Section 416 (b) exemptions. 72 STAT. 771, 49 U.S.C. § 1386(b). Pan American's rates under review here are no lower than the Board's latest minimum rates under a 1964 Board order renewing an exemption covering service to foreign points from various Air Force Bases. The present rates, however, are not offered under any exemption.

Flying Tiger's complaint contends that the Pan American tariff is an impermissible classification of a shipper rather than the familiar classification of a commodity and is therefore discriminatory and in violation of Section 404(b) and Section 403(b) of the Act, the latter being the Section which authorizes an air carrier to grant free or reduced fare carriage to specified classes of persons of which the United States Government is not one.

In Flying Tiger's complaint it affirmatively posed the issue as one "purely legal" for which there was "no reason, need, or requirement for an evidentiary hearing." Pan American in moving similarly for summary disposition pointed to the historical background of Board approval of low rates available only under United States Government Bills of Lading for military supplies; it also pointed to similar discrimination applicable to government freight carried by other carriers including Flying Tiger's charter rates with MATS, all substantially less than commercial rates.

Petitioner's complaint asserted that Pan American's rates violate Section 404 (b) of the Federal Aviation Act1 on the ground that the limitation to Defense Department shipments unjustly discriminates against other shippers as a matter of law. Petitioner asked the Board summarily to order Pan American to discontinue the challenged rates, averring that the notice and hearing contemplated by Section 1002(f) of the Act2 were unnecessary since Pan American's tariff was illegal on its face.

The Board dismissed Petitioner's complaint and declined for the present to initiate a formal investigation "looking to whether or not the subject rates of Pan American or the numerous other fares and rates currently applicable to military transportation are unjustly discriminatory." In taking this action the Board relied chiefly on its conclusion in Military Tender Investigation, 28 C.A.B. 902 (1959), that special fares for military personnel traveling at government expense do not violate Section 404(b) since such travel involves "circumstances and conditions" substantially different from those presented by travel by civilians.3

In this court the Board has maintained its position that carriage of military property for the Government involves "circumstances and conditions" justifying special rates. It argues additionally that military goods shipped by the Government and physically comparable goods shipped by private persons are not within the contemplation of the term "like traffic" and consequently that no question of discrimination can arise. Petitioner denies both contentions. We find it unnecessary to pass on either.

Nothing advanced at argument persuades us that Pan American's rates are illegal as a matter of law under the criteria set out in note 3, supra.

The narrow question presented by this record is whether the Board abused its discretion in refusing to investigate the allegation of unjust discrimination. We cannot say that it did. The duty imposed on the Board by Section 1002(a) of the Act, 72 STAT. 788, 49 U.S.C. § 1482(a), to investigate complaints when there is a "reasonable ground" for doing so is a duty to exercise its sound discretion. In the exercise of such discretion, the Board may dismiss even a legally sufficient complaint. Flight Engineers Int'l Ass'n v. C. A. B., 118 U.S.App.D.C. 112, 332 F.2d 312 (1964).

Petitioner's complaint provided the Board with no guidance as to the how and why of the Section 404(b) illegality it alleged to inhere in Pan American's tariff. That Section exists to protect shippers, not carriers. Cf. I. C. C. v. Baltimore & O. Ry., 145 U.S. 263, 281, 12 S. Ct. 844, 36 L. Ed. 699 (1892). The Board concedes and we assume for present purposes that that fact does not deprive Petitioner of standing as a carrier to challenge the Board's action in this court. But it seems to us that Petitioner's complaint had to make a plausible case that Pan American's rates would cause some substantial injury to shippers in order to require the Board to take action. We do not think that Petitioner's assertion that it "is a sometime shipper of transpacific airfreight of the kind and character * * * moved by PAA for the U. S. government under the low impedimenta tariff" is sufficient to do so.4

In holding that Petitioner's complaint did not require action by the Board we do not pass upon the Board's reliance on its decision in Military Tender Investigation, supra. Even if that decision was correct — and we intimate no opinion on the subject — it does not necessarily control the issue of the legality of Pan American's tariff here. In its Military Tender holding the Board relied chiefly on facts showing lower costs for the domestic transportation of military as opposed to civilian personnel and on the existence of strong competition between air and surface carriers for military passengers within the United States. What conditions of this general nature obtain with respect to the foreign transportation of military property we have no way of knowing from the Military Tender decision or from anything now before us.

In arguing that Pan American's rates are illegal per se, Flying Tiger relies also on the absence of the Government from the list of persons in Section 403 (b) of the Act, 72 STAT. 759, as amended, 49 U.S.C. § 1373(b), who may be afforded special rates.5 But that Section, as its heading indicates, seems to be concerned with the observance by carriers of tariffs they have filed and the avoidance of rebates except as authorized by that Section and Board regulations thereunder. Whether published rates are themselves discriminatory seems to raise a problem rather within the rubric of Section 404(b).

The Board argues, on the other hand, that Section 403(b) justifies Pan American's rates. This argument encounters the same difficulty as Flying Tiger's, namely, that the Section's concern is observance of published tariffs, not discrimination. Moreover, the authorization for reduced rates in this Section appears to deal exclusively with carriage of passengers except for its tangential adversion to the carriage of property in relief of general epidemics, etc. Cf. American Express Co. v. United States, 212 U.S. 522, 29 S. Ct. 315, 53 L. Ed. 635 (1909). And the Section seems to contemplate exemptions from its provisions concerning reduced rates only under such circumstances as the Board by regulation prescribes; no such regulations have been cited to us. Finally, even if Section 403(b) could be taken to establish the prima facie validity of special rates to the Government for military impedimenta and stores, those rates might still be subject to challenge under Section 404(b). Cf. Nashville, C. & St. L. Ry. v. Tennessee, 262 U.S. 318, 43 S. Ct. 583, 67 L. Ed. 999 (1923). We mention the Section 403(b) arguments only because the parties have argued them at length; all we decide is that Section 403(b) does not, as a matter of law, invalidate Pan American's rates.

Petitioner having failed to allege facts, adduce evidence or advance reasons compelling Board action on its complaint,6 we accordingly affirm the Board's dismissal of that complaint.

Affirmed.