14 CFR §297.20

1. (a)Not later than 60 days before the start of operations as a foreign indirect air carrier, every foreign air freight forwarder and foreign cooperative shippers association shall apply for registration with the Department, unless upon a showing of good cause, the Director, Office of International Aviation, allows application at a later time.
2. (b)Application shall consist of filing with the Department's Office of International Aviation, U.S. Air Carrier Licensing/Special Authorities Division, two copies of completed OST Form 4506, which may be obtained from the Department of Transportation, U.S. Air Carrier Licensing/Special Authorities Division.