Like most airlines before deregulation, Piedmont did not use a hub system.

She wondered if it was significant that the tour didn't take in any part of the hub system.

The first product was a mechanical brake and hub system.

The mergers and the hub system have combined to leave several airports dominated by just one or two airlines.

He notes, for example, that the hub system decreases the cost of providing air service - an obvious benefit to the consumer.

A major change is to the hub system.

But the other airlines continue to favor the hub system.

Changing planes is an inconvenience, but that's a small price to pay for the greater flight frequency made possible by the hub system.

United will also have to figure out how to make its hub system more efficient.

"The hub system is one of the things that will lift them out of bankruptcy."