Smiling in passport photos has indeed been banned in many countries. In the U.S., guidelines state that you must have a “neutral expression” with the eyes fully open. A slight, closed-mouth smile is acceptable so long as other facial features, such as the eyes and nose, are not distorted. Many …

Global Entry, Sentri, Nexus, and TSA Pre-Check are collectively known as “known traveler” programs. In your online profile go to the bottom of the Travel Preferences page to the box labeled “Known Traveler Number” and enter the number there.

No, not always. It is up to each airline’s discretion what to show and often this means showing only a few available seats at a time. Why, you ask? Several reasons – 1) this is proprietary information that could be exploited by competing airlines, and 2) these days an empty …