Upgrades when flying economy in US, priority security/boarding lanes, and lounge access. Don't care for baggage or flight awards so much.
(<25000, 25000-50000, >50000 miles - <25, 25-50, >50 flights?)
4-5 roundtrips in business JFK<->DUB/LHR per year [plus a few additional segments within Europe], plus ~4 JFK<->SFO/OAK/SJC in economy, and ~2 random e.g. JFK<->ORD per year.
In total that's... ~25 segments a year? and ~50k great circle distance miles.
Business transatlantic, economy intra-US
Work only, and work will pay for business transatlantic but not domestic. I'm away from home too damn much to travel for fun

but at least it's not *my* money.
See above: JFK-DUB, JFK-SFO, (newly: JFK-PDX), JFK-(DUB)-LHR, LHR-ZRH, JFK-ORD. Within the US, have been flying B6, have previously been flying ~exclusively EI or BA for European travel.
JFK. Will not consider LGA or EWR (I live in Brooklyn close to JFK).
Concierge (top tier) with Aer Lingus, but sick and tired of lack of reciprocal status for any US airline (and no, United doesn't count, as it doesn't provide tier points and doesn't recognize status, and doesn't serve JFK). Way more Avios than I know what to do with.
Membership but no status with JetBlue. C'est la vie. (Aer Lingus's weird interlining but no miles integration is ????)
I would like to consolidate onto *an* airline network, given EI is still aeons out from joining OneWorld. Don't care which one, as long as they'll status match and offer a seamless experience.