Delta Air Lines has teamed up with the Transportation Security Administration to let travelers check-in to flights using their mobile phones.

The paperless mobile check-in for domestic travel is initially available to Delta and Delta Connection flights departing from the airline's main terminal at LaGuardia Airport in New York. This measure will also serve to cut paper costs for Delta, an airline under pressure from high fuel costs in a struggling aviation industry.

"The strategy behind this is to give customers a more convenient way to check in,' said Ashley Black, a spokeswoman at Delta, Atlanta. "We are always looking to find ways to give customers more convenience."

Customers will have the option of using their mobile device to check-in and receive an electronic boarding pass via their Web-enabled devices.

Domestic travelers checking in at LaGuardia may simply download their boarding pass to their mobile devices via the site at http://www.delta.com and proceed directly to the airport security screening area.

At the security checkpoint, TSA will scan the electronic boarding pass, check the customer's ID and process the customer through security.

"We want to put more control in the hands of our customers and eventually we will launch this service in other major airports as well," Ms. Black said.

"This also addresses some environmental issues and Delta is extremely environmentally conscious," she said.

At the departure gate Delta passengers present their electronic boarding pass to the gate agent at boarding time and board with their designated zone.

Future enhancements include standby upgrades and same-day, round-trip check-in on delta.com, mobile and SMS check-in.

Delta claims to operate service to more worldwide destinations than any airline, with Delta and Delta Connection flights to 324 destinations in 62 countries.

Delta's mobile check-in option currently is limited to its main La Guardia terminal. It does not include the DL Shuttle Marine Air terminal.

"We have several goals for 2008 and one of them is eliminating long airport lines," Ms. Black said. "We have made that clear via our kiosks and are now driving more productivity with the paperless ticketing."