Currently based in BOS, but will be moving to a new job based in SF with more travel. (SF proper, not SJC/OAK/further afield.) Should I switch to UA or Alaska? Or try and maintain and grow on Delta?

1. What is most important to you in a frequent flyer program (FFP)?
Upgrades, waived fees (SDC/ticketing/etc, not bags), award redemption fees, customer service. Most of my personal redemptions are either shorthaul east coast, domestic transcon, or east coast - Europe (all in Y).

2. How many miles do you usually fly each year? How many flights/sectors?
Currently 40-50K miles, foreseen increase to ~90-100K per year.

3. What fare class do you usually buy?
Personal travel: Y/Y+. Business: Y for shorthaul, J for longer haul.

4. Are you able to choose your airlines and/or class of service? Do you travel for work and/or pleasure?
For business: yes, airlines. Policy says buy lowest cost Y with personal judgment for fewer layovers/time of day. Flights with one segment 8+ hours can be bought in J.

5. Which routes do you fly most often?
SFO/OAK-IAD/DCA, SFO/OAK-SEA (business, 1-3x per month).
Occasional SFO - LHR/BRU (business, maybe 1-2x per year).
SFO/OAK - BOS, AUS, PIT (personal, 4x-8x per year).

6. What is your home airport?
Soon to be SFO. BOS until early next year.

7. Do you have status in any FFP? What is it? How miles do you have banked in each FFP, if any?
I'm currently a happy DL Gold and AA Plat (AA achieved through status challenge, probably not renewing). Minimal miles banked in FFPs, mostly in Amex/Chase/SPG.

8. What are your preferred airlines, if any?
Delta, JetBlue