Only 4 very lucky categories of folks get to fly an active flightdeck
for passenger airlines in the US.
(In no particular order)
1) The assigned Flightdeck Crew who will operate the flight.
2) FAA Inspectors
3) Deadheading pilots on other airlines, whose companies have specific agreements in place (between the two airlines, subject to FAA, TSA, etc. approval), only under very specific conditions, and subject to capn discretion.
4) Employees of the airline operating the aircraft, who hold A&P licenses, only under very specific conditions, and subject to capn
discretion.
Up front rides very limited these days.
