Update provided by Andrea Villa with Harper Meyer:

Foreign-operated aircraft are required to have Letters of Authorization (LOA) to fly overseas. LOAs allow aircraft to conduct different operations, such as flying in RVSM airspace, doing certain approaches, working with the minimum equipment list, etc. The FAA’s backlog of work severely impacts obtaining letters of authorization (LOA) from the FAA for U.S.-registered aircraft operated by foreigners.

The backlog has been an issue in the past, but the problem has grown significantly, and operations are severely impacted. We are currently working with NBAA offices to try to get answers.

- November 2022