What type of plane is used in "Airport 1975"?

American Airlines had temporarily parked a Boeing 747-100 during their 1974 fleet restructuring, which worked out perfectly for Universal's budget. See, buying a plane just to blow a hole in it wasn't exactly practical, so the producers rented one from American for just $30,000 per day. After slapping some Columbia Airlines paint on it, and with the help of some classic practical effects, they could get all of their exterior flying shots without having to explain to insurance companies why they'd destroyed a multi-million dollar jumbo jet. The dramatic cockpit damage was just movie magic created on studio sets, which becomes obvious if you pay attention during the final landing scenes where they carefully avoid showing the supposedly damaged cockpit area. After its 15 minutes of fame were up, the 747 returned to normal airline duty and eventually hauled cargo for UPS, where it enjoyed a much quieter retirement than its fictional counterpart ever got.