The best for high altitude!
Around 8000 hrs in comand on that fantastic A/C, operating from high altitudes airports like La Paz (13400' ), CBB (8360'), TJA (6300'), SRE (9100') and many crazy placed airports in mountainous Bolivia and South America, with NDB, VOR approaches, and I couldn have asked for a more reliable aircraft than the 727-200 with 17R engines, just the best!!!