I travel so much I’ve set myself up as a sort of travel guru. I used to like to interrupt overheard conversations and give people tips on getting around various airports, or to stand in the security lines and make fun of people as they make obvious, terrible mistakes that delay their trip to the gates. I once witnessed an irate man arguing that his collection of hunting knives were not an issue and should be allowed through in his carry-on luggage. That was a banner day. Of course, whenever I start to feel smug these days I glance down…