Goods or services provided in the United States to a non-Iranian carrier transporting passengers or goods to or from Iran are permissible if they are:
(a)
Bunkers or bunkering services;
(b)
Supplied or performed in the course of emergency repairs; or
(c)
Supplied or performed under circumstances which could not be anticipated prior to the carrier's departure for the United States.
Code of Federal Regulations
[64 FR 20175, Apr. 26, 1999]