A reciprocity requirement applies to air freight forwarding. Registration as a foreign air freight forwarder is rejected in the absence of effective reciprocity.
"§ 297.2 Applicability.
This part applies to interstate air transportation of property and to foreign air transportation of property outbound from the United States by foreign indirect air carriers. It also applies to applications for registration as a foreign indirect air carrier of property.
§ 297.3 Definitions.
For purpose of this part: 
(a) Foreign air freight forwarder  means a foreign indirect air carrier that is responsible for the transportation of property from the point of receipt to point of destination, and utilizes for the whole or any part of such transportation the services of a direct air carrier or its agent, of another foreign indirect cargo air carrier as defined in part 296 of this chapter.  [...]
(d) Foreign indirect air carrier  means any person, not a citizen of the United States, who undertakes indirectly to engage in the air transportation of property.
[...]
§ 297.20 Filing for registration.
(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.
[...]
§ 297.22 Procedure on receipt of registration application.
After review of a registration form filed under § 297.20, the Department will take one or more of the following actions: 
(a) Indicate by stamp on OST Form 4506 the effective date of registration, and return to the carrier the duplicate copy of OST Form 4506 as evidence of registration with the Department under this part; 
(b) Reject an application for registration for failure to comply with this part, for reasons relating to the failure of effective reciprocity, or if the Department finds that it is in the public interest to do so.  [...]" (Code of Federal Regulations, 14 C.F.R. (last amended on 10/06/2021) §§ 297.2, 297.3, 297.20 and 297.22)
Code of Federal Regulations, 14 C.F.R. (last amended on 10/06/2021) §§ 297.2, 297.3, 297.20 and 297.22
[<a href="https://www.ecfr.gov/current/title-14/chapter-II/subchapter-A/part-297">Reg</a>]