To leave the airport or not leave the airport, that is the question. AA from U.S., arrive 12:05pm, BA to Asia, depart 7:45pm. It would seem that I'd have to have an airtight plan... Know which terminal I'm landing in, know where I'm going to catch a bus or a tube, know the travel times, which terminal when I get back... Security, security, security... and also Customs... I've got GBP's in my pocket, but can't find that Oyster Card... It seems to me like it would have to be a well executed plan to even have a mere 2 hours to catch a London vibe, a Kew vibe or a Windsor vibe. Doable? So to all you LHR connection saavy travelers, let's have the skinny, please?! We're talkin' next Sunday.