I've started flying more for work lately (4-5 flights per month) and it seems like every flight I'm on has the gate agents begging people to check carryons because the overhead bins are full and anyone in the later boarding groups is being told they have to. Had it happen on Alaska, United, and Southwest so it doesn't seem to unique to one airline. I never flew much in the past but I don't recall this being an issue in the past. Are more folks carrying on these days?