Indigo has signed the largest jet order deal in aviation history

India's IndiGo has signed a deal for the largest jet order in aviation history, Airbus announced Tuesday. It's also the first order for Airbus' re-engined A320. IndiGo, India's largest low-cost airline, signed a memorandum of understanding to buy 30 A320s and 150 A320neos -- the A320 new engine option that Airbus launched Dec. 1, with entry into service set for 2016. "It is the largest single firm order number for large jets in commercial aviation history, and also makes IndiGo a launch customer for the A320neo," Airbus said. The order will continue to allow IndiGo to offer low fares, while reducing its costs and improving environmental performance, airline co-founders Rakesh Gangwal and Rahul Bhatia said in a news release. Airbus says the A320neo will use up to 15 percent less fuel than existing A320s, cutting up to 3,600 metric tonnes of carbon dioxide emissions a year, with a double-digit reduction in nitrous oxide emissions and reduced engine noise. Airbus is offering both CFM International LEAP-X engines and Pratt & Whitney PurePower PW1100G engines on the A320neo. The release said IndiGo would select engines at a later date. IndiGo already had ordered 100 A320s through Nov. 30, 2010 and received 37 of those, according to Airbus. John Leahy, Airbus' chief operating officer, customers, said: "This order positions IndiGo to take full advantage of the predicted growth in Indian air travel and we are delighted that they continue to build their future with Airbus."