Nairobi Jomo Kenyatta springs to mind at 5,327' AMSL. That provides a cue for a story about a co-pilot (NATO reporting name OSLO - and yes, I know there were a few with that descriptor) playing footy at Nairobi. He wondered why he got tired so quickly and asked a friendly crewmate who explained that he was quite high up and the air was a smidge thinner. He then (apparently) asked how high above sea level he was when he had a kick-about at the next destination, he was on the beach at Mombasa at the time.
I would imagine that at 9,228' AMSL, The old Quito airfield would be quite high for Albert's adventures.