Most I have managed in one year is just over 8,000 - all on BA, mind - none of this US-hopping going on! I found it a really tough year, not seeing my family enough, eating too many aircraft and hotel meals.. It was when 6,000 TPs got you to "you have earned all of the GGL benefits" on ba.com and 8,000 was seriously tough work! I have met a couple of 10k+ people - one who commuted to JFK from LCY each week and our own, esteemed
c-w-s, but more than 5,000 per year is not really for me any more