Hi, I'm based in San Francisco, and travel internationally 2-4 times/year for work + leisure, on economy tickets, to different regions. I have active accounts on Delta and United, but just booked a ticket on British Airways. I have had an American Airlines frequent flyer account in the past, but have found their service terrible - expiring miles even after I completed their "challenge" to reactive them. I'm looking to sign up with a new airline for accruing points on any OneWorld partner airlines I fly in the future. Are there any that you can recommend, or differences you can highlight? Thanks!