American Airlines says it will buy 42 Boeing 787-9
jets as part of a move to improve the fuel efficiency of its fleet.

American said Wednesday it expects to get the planes delivered
from 2012 through 2018.

The airline says it has rights to buy up to 58 more copies of
the plane later on.

American is the nation's largest airline, and about half its
fleet is composed of fuel-guzzling MD-80 series jets. That became a
big disadvantage when jet fuel spiked over $4 per gallon this
summer.