Rich:
Not spending the night in SJO on 3/11, but maybe we can partake of the local custom during our 2 1/2 hour layover in BOG. (On second thought, let's skip the local custom and stick to alcohol.) Or maybe dinner in Quito during your 4 hour layover?
BTW, I don't think it's entirely coincidence that Rich and I selected many of the same flights. The trick for the cheap 500k (at least in business class) is to stick to Central America as much as possible. This is particularly true because Aces, Saeta and Aeropostal are all singles class airlines.
BTW, I selected UIO as my ending point only because CO's business class fare to DFW was hundreds of dollars less from UIO than it was from CCS, PTY or LIM. Because Avianca can get you to all of these places from BOG, it really depends how much it will cost you to return home.