"Majority" is a correct, but subtle, term. Your implication above is that it means "nearly all the flying" is at night, when the truth is that only about half of it is.

At FX, don't forget that the same jets that are hub-turning around a midnight sort in Memphis are also hub-turning in the morning and afternoon around a noon sort in Memphis.

Additionally, there are a good chunk of jets that are doing single-departure international globetrotting, too.

So, there are plenty of opportunities for pilots throughout the seniority list to *not* do back-side-of-the-clock flying, and a good number who have the seniority to do exclusively day flying.