Many airlines have wireless access on some of its planes, but, as of June, Delta has installed Gogo's inflight Internet service, which works with laptops, smartphones, and other wireless handheld devices, on more than 500 aircraft, the vast majority of its domestic fleet. The airline plans to roll out the service on its remaining 50 or so planes later this year.
Cost: $4.95 for a single flight that lasts up to 1.5 hours, $12.95 for flights of three hours or longer, or $34.95 for a monthly subscription.