When one airline buys equipment the others think they should get in line.

As an example the airline bought in March 2013 175 new 737-800s in a deal worth nearly $15.6 billion at list prices.

Worldwide, airlines buy about $19 billion worth of planes every year.

In the early 1970s, the airline bought five Boeing 747s.

To keep costs low, the airline bought many used aircraft from around the world.

There are two schools of thought about which airlines to buy.

"They were not trying to figure out how to bring 500 people there with the finest wines that the airlines can buy."

"We should encourage airlines to buy new aircraft to replace those which are 15 or 20 years old."

Boeing thought that the only way to get airlines to buy a jet plane was to show them one.

The airlines bought their first $50 million in coverage from standard insurers.