Originally Posted by
zkzkz
If lounge access is a top priority then 5 return flights in A or F on three-cabin aircraft would be enough to earn Oneworld Sapphire with BA. It would take 8x return trips in business (including "first" on two-cabin aircraft).
That would get you lounge access for free on any Oneworld itinerary. Not necessarily recommending that as there are reasons it's usually best to stick with the program of the airline you're flying but there are advantages the other way too.
To qualify for oneworld Sapphire status with BA, one must fly a minimum of four BA-coded or IB-coded segments. Where would they come from?
And AA flights between NYC and DFW are typically flown in two-cabin aircraft.