air-to-ground technology

Airlines have hit fliers with a lot of extra charges these days. They charge for food, drinks and checking bags. JetBlue even said it would dispense with complimentary disposable pillows and start charging $7 for a take-home pillow-and-blanket set.

On Tuesday, however, Delta Airlines announced a service that few people should complain about paying for: Wi-Fi. While a number of other airlines have been trumpeting Internet availability, so far that's been a special service available only in business class and first class. Delta is the first airline to offer Wi-Fi in coach.