I get the feeling that on the really small planes, because so many people have to gate-check, they have a very efficient process to getting the luggage back out. Does the Sky Check cart go directly into the hold, or are the bags still loaded manually and then unloaded at the destination?
Either way, due to my very short layover I'll stick to my plan to carry on, but I'll be interested to see the process.
A spreadsheet comparing bags and airlines/planes would be great! I've never seen anything like that. I started my own list of the airlines I fly, with their published allowances, but to do a really comprehensive job would be a massive undertaking. It can get complicated. For instance, EasyJet has two sizes: one smaller set of dimensions that is guaranteed cabin space, no matter how crowded the flight, and another size for which you won't be charged a fee, but the bag could be gate-checked if the bins are full.