Can we officially declare the past week the worst week for travel ever? After two massive blizzards screwed up holiday-travel plans nationwide, the failed terrorist bombing of an airplane on Christmas Day has led to a slew of new restrictions. In one of the more arbitrary-seeming moves, some airlines have begun telling passengers that they must remain seated and have no items in their laps for the final hour of their flights. Air Canada has also said it is limiting passengers to one carry-on item, per the advice of the U.S. government. Also expect increased screenings at airport security checks.