I’d base my predictions on that 5 years is an eternity in the Airline Industry. Projections are just that..projections. GK likes to merge (acquire) other Airlines every ten years or so. The last one, AirTran was September 2010...So, I would expect another merger (acquisition) within the next 2-3 years. Age 67-70 could also slow upgrades if passed by Congress as well as the eventual next recession. Just too many variables that have yet to unfold to give an accurate upgrade timetable IMO.