You're always going to have at least 20% vote no.

5% will vote no because of "it doesn't get enough, doesn't meet inflation, doesn't do some big overarching reason, you shouldn't vote yes on the first agreement" or similar. You can't pin these people down on any specific reason, or, really, get them admit they didn't read the agreement past the pay rates, and in some cases will just say "well, that's what everyone I've talked to (or read on the internet) is doing".

5% will vote no because of a single specific reason. Retirement, medical freedom, didn't get an extra day off, etc. That single reason may be broad, or very, very specific.

5% will vote no because something in the agreement might change the game they had going on. In every contract, there are dozens of "good deals" that people get worked out for themselves that they've played with great success, and these usually are a result of some very specific situation and interaction with contract language. These are harder to deal with because these folks will give every reason BUT the real one, and generally, they never let on what deal they had going on, so you really can't tell if the new rules mess them up or not. Generally, these folks keep these "deals" very, very tight to themselves and a close number of buddies.

5% will vote no because a blinding hatred of ALPA , the company, the world, the universe or any of the above.