Business jets of all sizes make up nearly two-thirds of the total domestic corporate fleet.
Solomon Airlines no longer has any aircraft other than its small domestic fleet.
Thai Airways, which recently combined its international and domestic fleets, is having to cancel some flights, with others running late.
The two episodes, coming just months apart, prompted the government to ground the entire domestic fleet of both airlines for inspections.
Three thousand aircraft in the domestic fleet were now more than twenty years old.
These aircraft will be used to replace the less fuel efficient domestic fleet of Boeing 757-200s.
Economy Plus is available on all aircraft in the domestic and international fleet.
United Airlines has added a new feature to its domestic fleet: allowing passengers to order products from 13 companies by telephone.
Safety concerns exist about some of the older and less reliable aircraft in its domestic fleet.
Indeed, the entire airline industry is doing better, due to a relatively strong economy and a smaller domestic fleet.