Airbus A320 39 3.7 years On 194 airlines operating this type of aircraft Jetstar ranks 52
Airbus A321 6 4.5 years On 63 airlines operating this type of aircraft Jetstar ranks 17
Boeing 747 27 16.2 years On 101 airlines operating this type of aircraft Qantas ranks 41
Boeing 767 26 17.7 years On 107 airlines operating this type of aircraft Qantas ranks 67
Boeing 737 17 18.5 years On 294 airlines operating this type of aircraft Qantas ranks 96
Says it all really. Or was that time to command in each airline? Or did someone mention relative maintenance costs? Or was the word neglect?