It’s likely that the most challenging application of business aviation ever attempted is the corporate shuttle service operated between Anchorage and Alaska’s North Slope tundra to transport oil field and Trans Alaska Pipeline workers to their jobs.

The chief pilot of an FAR Part 91 corporate flight department that often fields Gulfstreams through Alaska to Asian destinations provided this succinct advice to flight crews who may be headed above 60°N latitude for the first time:

As mentioned in the main text, U.S. Customs and Border Protection no longer confers “permission to proceed” authority to aircraft entering U.S. territory at Adak Island in the Aleutian Chain. Previously, aircraft using Adak as a tech stop on the way back from Asia could arrange to take on fuel at Adak, then with prior arrangement, proceed to Anchorage to clear Customs. Here, courtesy of Universal Weather & Aviation, is the two-part message received last year from CBP: