Originally Posted by
N965VJ
It is up to each individual airline to determine what their carryon bag rules should be, and those are written into the Operations Specifications that the FAA signs off on. Having TSA employees trying to enforce all the different policies would be a disaster, and they have enough problems to deal with such as Red Team test failure that are off the charts.
Don't all US legacy carriers have the same carry-on restrictions: One bag (22''x14''x9''), and one personal item (briefcase, purse, etc.)? If so enforcement is relatively easy. Regardless I agree with you that bag enforcement is the job of airlines, not the TSA.