I imagine the FAA Administrator is a tough job to staff. The population of people with aviation experience at an executive level (whether public or private) is pretty small. To add, the person you nominate has to want the job. With commercial aviation reeling from Covid, Boeing's shenanigans with the MAX and 787, etc, I'd think some qualified people would respond "thanks but no thanks."
However, the reality is that, in the hierarchy of qualifications for these politically-appointed jobs, experience is pretty far down the list. It's Identity Politics above all, which means the number one criteria Democrats are looking for is that the nominee either be a woman or a "person of color."
When you constrain the candidate pool that much, it's no surprise that you end up with candidates who have really thin qualifications.