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Yes, we thought it was a bit odd as well—until we realized how much it organized the chaos of zone-by-zone boarding, eliminating the pre-emptive swarms that tend to crowd the gate. Have you noticed any changes at the airport lately? Tell us at tripdoctor@aexp.. Nikki Ekstein is an Editorial Assistant at Travel + Leisure and part of the Trip Doctor news team. Find her at on Twitter at @nikkiekstein.July 08, 2013 insert nut On a recent trip through Houston’s IAH, we noticed these unusual—but clever—markers, which United is now using to corral flyers waiting to get on their plane.com