BOAC - flying out of KEGE(6000'?) 'Improved Performance' is a way of life, especially when the temperature gets to freezing or higher.
Medelin Colombia(6000'?) IMP PERF is a fact of life. San Jose(MROC) Costa Rica(3000'?) sometimes. Don't recall if KGUC (6,000'?) or La Paz Bolivia (13,000'?) used/required IMP PERF.
Come see the mountains from low altitude, they're beautiful!
