The U.S. airline industry is chronically in dreadful shape, with Aloha, ATA, Skybus, Eos, Silverjet, Maxjet, and now Zoom having shut down. Midwest merged into Frontier. American went bankrupt and the corpse merged into US Airways, although the surviving company is still called American. Sun Country went bankrupt but is still flying, Frontier went bankrupt but seems to be surviving as part of regional carrier Republic, and most of the remaining airlines are hanging on with a combination of somewhat higher fares (much higer for trans-Atlantic) and very full planes. The weak economy has kept them from raising fares as much as they want, but they're not passing on the recent lower fuel prices. Southwest and Airtran, two relatively healthy low-fare carriers have merged, with the surviving airline Southwest with more east coast and international routes.
Travel dates back to antiquity where wealthy Greeks and Romans would travel for leisure to their summer homes and villas in cities such as Pompeii and Baiae. While early travel tended to be slower, more dangerous, and more dominated by trade and migration, cultural and technological advances over many years have tended to mean that travel has become easier and more accessible. Mankind has come a long way in transportation since Christopher Columbus sailed to the new world from Spain in 1492, an expedition which took over 10 weeks to arrive at the final destination; to the 21st century where aircraft allow travel from Spain to the United States overnight.