I’ve had 2 OAL pilots request a JS that were sporting beards. Not just stubble. Told them both sorry but no.
To my knowledge the ONLY individual allowed to ride the JS with a beard is Secret Service, at least it used to say that in the FOM. FAA inspectors aren’t even allowed a beard.
Personally I hope Delta doesn’t change this rule. It’s a slippery slope. It’s pretty easy for the captain to decide beard/no beard. Trying to determine which style of Operator Chic is permitted just adds unnecessary angst to the job.