Yes, when they have to do a Long Sell everything is manually entered, like flight number, flight date, booking class, etc. This doesn't mean that they will be able to do it, but if you see it on lan.com (lowest award price only), it should be available for AA, BA or QF, but just in case, if you don't see it on BA.com, try Qantas.com trough awardnexus, which is free for FT users (100 points every 90 days).