Thanks, One Eleven.
Of course, if you have aircraft, or engine, high altitude development/performance testing to be done, where better to get it done than at the world's highest airport? (Is that how you acquired that photo, One Eleven??)
Panagra, later PanAm, used to stage through La Paz with their high powered 720's. The PanAm station engineer used to keep a very special rubber mallet handy for those days (most days!) when an engine would 'cold hang' during start-up: hit the FCU in just the right place, at just the right moment, and the JT-3D would accelerate through the stall... Worked every time - skill and experience was as important as manuals then.
Sorry, nothing to post: OPEN HOUSE