Airbus, which recently announced an output increase for its A320 jet family, has amassed enough excess orders through overboooking to justify further production increases at some point in the future, its sales chief said on Monday. Airbus last month announced plans to increase output of its best-selling jet family to 50 aircraft a month in 2017, up from 42 a month now. “It does appear that we have more than enough overbooking to comfortably cover rates above 50, perhaps above 60 (a month),” John Leahy told the Istat air finance conference.