I know UA has been changing around overhead bins for quite a while as well as adding tons of new aircraft into the mix... is there any chance that as of Q2-2018 the bins on all the mainline aircraft are consistent? Or is it still hit-and-miss? I picked up a travelpro bag that I'd consider a "large" rollaboard, but it fits into at least the new A319 bins and the 739 bins ... I'm just trying to find out whether I can reliably expect this to fit on the rest of the mainline fleet or if there are still AC types I might be stuck gate-checking on...