Originally Posted by
tikchik
I don't believe La Paz was a Tech Stop.
No; Santa Cruz was a tech stop. The origin, La Paz (El Alto Airport), is so high (13,325 ft) that even the 757 cannot take off with enough fuel to make it back to MIA. So, the bird took off with a minimal fuel load, then made a stop at the much-lower Santa Cruz airport to take on enough fuel for the intercontinental flight.