There will come a time when airports become so congested it will become uneconomical to use a large twin like a 777-300ER multiple times a day. But with business travelers still demanding frequency, those days are a while away yet.

Bernie Leighton writes a thoughtful post on why airlines seem to be ordering large aircrafts—although not the biggest ones as Alex pointed out the other day

The residual value of composite planes isn't still fully known, he argues, but the bet is that those bigger aircrafts can be sold—or leased again—more easily as the market keeps expanding:

airlines are not buying aircraft for today – they are buying aircraft they hope they can grow into.