Houston was the headquarters of Continental Airlines until its 2010 merger with United Airlines with headquarters in Chicago; regulatory approval for the merger was granted in October of that year. Bush Intercontinental became United Airlines' largest airline hub. The airline retained a significant operational presence in Houston while offering more than 700 daily departures from the city. In early 2007, Bush Intercontinental Airport was named a model "port of entry" for international travelers by U.S. Customs and Border Protection.
Until 2010, which airline made Houston its headquarters? Where is United Airlines' largest air hub? With which airline did Continental Airlines merge? How many daily flights did United Airlines offer from Houston? In what year was Bush Intercontinental named a model by U.S. Customs?