Interestingly I'm booking about 4-6 weeks out and when I look at the seat map F is generally totally filled or nearly filled. Even when I pick seats in Y all decent MCE seats are taken forcing me to go back and look at alternative flights. For example, DFW/PHX on mostly 321 neos. Nothing in F and MCE other than middle seats already taken. Ended up routing DFW/TUS/PHX do get a MCE seat on 321 ceo-and not the exit row. Gonna be a hard year for upgrades.