Originally Posted by
dera
The "adequate O2 seal" is a more of a myth and the AC where the FAA "studied" it is 30 years old. In Europe, beards are common with pilots, and for some reason, they don't have that problem.
You can blame the ****ing match between Delta and the FAA and the precedent it set on that rule never changing in the US.
https://www.ntsb.gov/legal/alj/OnODo...ation/4804.PDF
One airline in the US already went tie less. Not for much longer I assume with a certain merger.
Also, Guam-based United pilots don’t wear ties.