After a long trip, all you want to do is get home and not wait in long airport lines. The Mobile Passport app allows users to use their mobile phone to submit passport and customs declaration information directly to US Customs and Border Protection. You'll answer a couple of questions about your trip and confirm your flight information before being given an encrypted barcode that's valid for up to four hours. That means you can skip the traditional paper forms and have everything in the palm of your hand. Mobile Passport expedited lanes are currently available in about 30 airports. Just don't forget your actual passport!