pre_text: item 2 . properties flight equipment and fleet renewal as of december 31 , 2017 , american operated a mainline fleet of 948 aircraft . in 2017 , we continued our extensive fleet renewal program , which has provided us with the youngest fleet of the major u.s . network carriers . during 2017 , american took delivery of 57 new mainline aircraft and retired 39 mainline aircraft . we are supported by our wholly-owned and third-party regional carriers that fly under capacity purchase agreements operating as american eagle . as of december 31 , 2017 , american eagle operated 597 regional aircraft . during 2017 , we reduced our regional fleet by a net of nine aircraft , including the addition of 63 regional aircraft and retirement of 72 regional aircraft . mainline as of december 31 , 2017 , american 2019s mainline fleet consisted of the following aircraft : average seating capacity average ( years ) owned leased total .
post_text: .
table: Average SeatingCapacity AverageAge(Years) Owned Leased Total
table: Airbus A319 128 13.8 21 104 125
table: Airbus A320 150 16.7 10 38 48
table: Airbus A321 178 5.4 165 54 219
table: Airbus A330-200 251 6.0 15 — 15
table: Airbus A330-300 291 17.4 4 5 9
table: Boeing 737-800 160 8.1 132 172 304
table: Boeing 737-8 MAX 172 0.1 4 — 4
table: Boeing 757-200 180 18.1 31 3 34
table: Boeing 767-300ER 209 19.1 24 — 24
table: Boeing 777-200ER 269 17.0 44 3 47
table: Boeing 777-300ER 310 3.8 18 2 20
table: Boeing 787-8 226 2.1 20 — 20
table: Boeing 787-9 285 0.7 14 — 14
table: Embraer 190 99 10.2 20 — 20
table: McDonnell Douglas MD-80 140 21.3 13 32 45
table: Total 10.1 535 413 948
question: Analyse this data from a financial earnings document. what percent of american's total planes carried fewer than 100 pasengers?