Just who "expects air travel to grow significantly?"
Not the airlines, nor the airport operators, nor the Air Traffic authorities.
Price of oil will continue to rise, economies worldwide are in ultra-long torpor, airliner leasing is becoming increasingly costly, and will continue, unit costs of new airliners are rising, airfares and air travel costs are projected to rise exponentially....and yet there are wishful thinkers here who believe an upturn is just around the corner. This naive viewpoint is irresponsible and stupid.
Apart from agreeing with WWW, who is at the sharp end, there is nothing further for me to say. (You optimists will be mighty relieved!). And although I am in a secure widebody job, I cannot but wish to help those considering throwing their money away. I have been extremely lucky so far. New entrants haven't got a chance....unless they join the military.