For the airlines that I am quite familiar with, here are my best/worst features:
British Airways
pros: No blackout on club/1st awards, good partner promos, allow household miles to be pooled
cons: No mileage on discount tickets
Northwest Airlines
pros: Unlimited domestic upgrades, reduced off peak awards, 125% bonus for Plat.
cons: No intl. upgrades for Plat., no mileage for cybersavers
United
pros: Blackouts waived for 1K, SWU for 1Ks
cons: Mileage Plus is a follower not a leader in FFPs.
[This message has been edited by PG (edited 12-09-2001).]