Southwest Airlines and satellite television provider DISH yesterday announced a new deal to bring free live and on-demand TV to Southwest's 400 Wi-Fi-enabled planes. While the service is accessible from many Internet-connected devices, Southwest and DISH highlighted compatibility with Apple's iOS devices and gave away roughly 100 iPad 2 units to customers on a Southwest flight.Beginning today for Southwest Customers using iPhone, iPad and iPod touch, or most other Internet-ready personal devices, DISH is providing free access to live TV and up to 75 on-demand shows on the airline's more than 400 Wi-Fi-enabled aircraft. The news was unveiled by DISH's "Boston Guys" who surprised each of the passengers aboard a Southwest flight from Boston to Baltimore with a free iPad 2 on behalf of the two companies. Southwest Customers and Crew greeted the news with spirited applause, as for the firs