Originally Posted by kryten22uk
If you went BA from LHR you can go out in F and back in J (or vicce versa) for 2 people (using the Amex 241) for 200k BAMiles on the dot. And no cash. Which sounds perfect to me.
Seconded, although i'd do F on the NRT-LHR sector as both returns are long day flights which gives you more opportunity to enjoy the (reputedly excellent) F service on this sector.