49 C.F.R. § 1546.101

Each foreign air carrier landing or taking off in the United States must adopt and carry out, for each scheduled and public charter passenger operation or all-cargo operation, a security program that meets the requirements of—

(a) Section 1546.103(b) and subparts C, D, and E of this part for each operation with an aircraft having a passenger seating configuration of 61 or more seats;

(b) Section 1546.103(b) for each operation that will provide deplaned passengers access to a sterile area, or enplane passengers from a sterile area, when that access is not controlled by an aircraft operator using a security program under part 1544 of this chapter or a foreign air carrier using a security program under this part;

(c) Section 1546.103(b) for each operation with an airplane having a passenger seating configuration of 31 or more seats but 60 or fewer seats for which TSA has notified the foreign air carrier in writing that a threat exists; and

(d) Section 1546.103(c) for each operation with an airplane having a passenger seating configuration of 31 or more seats but 60 or fewer seats, when TSA has not notified the foreign air carrier in writing that a threat exists with respect to that operation.

(e) Sections 1546.103(b)(2) and (b)(4), 1546.202, 1546.205(a), (b), (c), (d), (e), and (f), 1546.207, 1546.211, 1546.213, and 1546.301 for each all-cargo operation with an aircraft having a maximum certificated take-off weight more than 45,500 kg (100,309.3 lbs.); and

(f) Sections 1546.103(b)(2) and (b)(4), 1546.202, 1546.205(a), (b), (d), and (f), 1546.211, and 1546.301 for each all-cargo operation with an aircraft having a maximum certificated take-off weight more than 12,500 pounds but not more than 45,500 kg (100,309.3 lbs.).