Air Service Agreement arbitration (1978)

The Air Service Agreement arbitration (1978) resolved a United States-France aviation dispute on 9 December 1978. The parties made the route-rights decision binding but expressly made the answer on American countermeasures a non-binding advisory report. The tribunal's reasoning nevertheless became an important authority on proportionality and the relationship between countermeasures and dispute settlement.

The dispute

France refused Pan American's proposed West Coast-Paris service involving a change to a smaller aircraft in London. On 3 May 1978, French police instructed the arriving aircraft to return without unloading. The United States required French carriers to file schedules and ordered suspension of Air France's Paris-Los Angeles service via Montreal. That second order was never implemented: the parties' agreement to arbitrate on 11 July required the relevant American orders to be vacated and provided interim flight arrangements.

Decision and advisory reasoning

By two votes to one, the tribunal decided that a United States-designated carrier could change aircraft size in London if its service remained continuous. Unanimously, it advised that the United States had been entitled to take the measures at issue. It assessed proportionality by reference both to commercial losses and to the importance of the disputed principle. Paragraph 83 found the American measures not clearly disproportionate, while acknowledging that the evidence permitted only an approximate assessment.

The tribunal did not treat a duty to negotiate or the prospect of arbitration as an automatic bar to countermeasures. It warned about escalation and required moderation and a genuine effort to resolve the dispute. Paragraph 96 distinguished a tribunal able to provide interim protection: the power to initiate countermeasures disappears to the extent that the tribunal can achieve their legitimate objectives, while existing measures may have to end if the tribunal so directs. The scope of the tribunal's powers therefore matters.

Significance and limits

The International Law Commission's 2001 commentaries cite this case in explaining proportionality and the procedural conditions for countermeasures. They also clarify that an injured state's mistaken belief in a breach is insufficient: a prior internationally wrongful act is required. Countermeasures seek compliance rather than punishment and remain subject to other legal limits. The 1978 reasoning does not supply blanket authority for sanctions programmes or eliminate treaty-specific constraints.

See also

Countermeasures under the ILC Articles on State Responsibility (2001) · Naulilaa arbitration (1928) · Retorsion · Non-intervention principle and economic coercion · Economic warfare

Sources

• Arbitral Tribunal, Case concerning the Air Service Agreement of 27 March 1946 between the United States of America and France, decision of 9 December 1978, Reports of International Arbitral Awards, vol. XVIII, pp. 417-493, especially pp. 418, 420-422 and 443-447, paragraphs 1-9 and 80-99 and the dispositive answers.
• International Law Commission, Draft Articles on Responsibility of States for Internationally Wrongful Acts, with Commentaries, Yearbook of the International Law Commission (2001), vol. II, part two, Articles 49, 51 and 52 and commentaries, especially Article 49 commentary paragraph 3 and footnote 746, Article 51 commentary paragraphs 2-7 and Article 52 commentary paragraphs 2-8.