Airline passengers will soon have a new option for getting wired at 30,000 feet.

This morning, Delta Air Lines said it will offer wireless Internet access across its entire domestic fleet by mid-2009. Though much larger in scale, the service is identical to the one used American Airlines (AMR), which Walt reviewed earlier this year.

Provided by Aircell’s Gogo, Delta’s (DAL) in-flight broadband will offer 3.1Mbps-connectivity for $9.95 on flights three hours or less, and $12.95 on flights of more than three hours. Not an unreasonable price. According to a 2007 survey by Forrester Research, 26 percent of leisure travelers would pay $10 for Internet access on a two- to four-hour flight and 45 percent would pay that on a flight longer than four hours. For business travelers, the percentage is quite a bit higher.

“Time on an airplane was either time lost or time found,” said Tim Mapes, Delta’s vice president of marketing. “This is going to totally change the dynamics of what a business trip is. Our customers are demanding of us the same type of wireless service they have on the ground.”

And they may even be able to use it, if they can get their laptops past The Department of Homeland Security …