ive just come back stby from BKK on BA and asked for exit seats because my other half is 6'5" and has a bit of difficulty with the tray tables,leg room etc,and the best thing to do is ask at check in.some people are miserable and sour faced,but some can see the problem,seeing as he's standing next to me so they can see im not bulls****ing,and some of the check in staff are helpful.on the way to BKK,economy was full so we ended up in traveller plus anyway,but on the return there were some seats in economy but somehow the check in agent got us seats behind each other,him being on the exit row,and for this we were extremely grateful.i hate asking for it because i know the first thing they think is that were asking for an upgrade when were not.ask anyway,you might get lucky,if not,ask the crew onboard!good luck!