If I can cast a little UK light on this issue?
Airports under the UK system are Categorised A, B and C.
Airlines are required to certify crews as 'qualified' to operate into the appropriate airports. Cat A ('Normal' airports) are re-certified at each Sim check as a 'routine' general clearance. Cat B require crews to make a thorough self-brief, by written brief or audio-visual, on the particular 'differences' from 'normal' for these. Cat C require either a specific sim check or actual flight under check.
If the US is similar, I think too much is being made of Aterp's post? I assume Branson would either be Cat A or B in the UK system.