Washington--The nation's three largest airlines announced a deal aimed at providing worldwide airline passengers with broadband services. Terms were not disclosed. American Airlines Inc., Delta Air Lines Inc. and United Airlines Inc. have signed a letter of intent with Boeing Co. to form a new global business venture that will bring Internet access, e-mail, live television and other services to the skies. The agreement calls for each airline to contribute funding, certain intellectual property and other assets necessary to fulfill the venture's mission. As part of the agreement, the three airlines will equip a total of 1,500 aircraft with the venture's high-speed broadband Internet access, which will retain the Connexion by Boeing name.