The Associated Press July 11, 2011, 4:11PM ET

Frontier adds Rockford, Ill to Denver destinations

Frontier Airlines said Monday it would give members of its frequent-flier program double miles for certain trips in September and would begin nonstop flights between its hub in Denver and Rockford, Ill.

The airline also extended its schedule for booking flights through March 18, 2012. The schedule includes resuming seasonal nonstop flights between Denver and both Ixtapa in Mexico and Liberia, Costa Rica.

The new Denver-Rockford flights will operate three days a week starting Dec. 15, Frontier said. The airline said it would be the only nonstop carriers between those two cities.

Frontier is owned by Republic Airways Holdings Inc. The shares fell 7 cents to $5.23 in afternoon trading.

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