Delta offers miles for online check-in

Delta Air Lines, which has been heavily promoting its Web site, has launched a new incentive to online customers: more frequent flier miles. The airline said Thursday that customers who print their boarding passes on their computer and check in through Delta.com will get a one-time bonus of 1,000 miles.

Delta.com's online check-in is available six hours to 30 minutes prior to departure. The frequent-flier mileage offer lasts through Dec. 31.