Las Vegas, Phoenix, Honolulu, and Lihue are featured in United's new deal. Book tickets by February 22.
Glasgow, Lisbon, Shannon, and Venice are featured in US Airways' new deal.
AirTran's deal includes flights to Miami, Orlando, San Diego, and San Juan. Travel is valid through early June.
Destinations in Virgin America's new offer include Las Vegas, Los Angeles, Seattle, and Washington, D.C. Travel is valid through May 21.
