(KRT) - The federal government is asking airlines to eliminate size restrictions for carry-on baggage at airport security checkpoints nationwide - a shift that some warn could lead to crowded overhead bins and testy passengers.The Transportation Security Administration sent a letter to airlines last month, asking them to remove sizing templates at checkpoints, to provide consistency and offer "one standard that will allow for a smooth transition for the traveling public.""It's an effort to make the process as efficient as possible without any compromise of security," TSA spokesman Paul Turk said.For passengers with a penchant for bringing oversize bags onboard,...