I guess a definition of what your target is to take a guitar along with you would be in order. Not too different from the band charters and such that you have talked about. So, what do you intend to do? Play for people or just have a guitar to practice with?
I had a situation a few years ago where I went to training for my job. A week away by myself in some forsaken town in NJ. I could drive there so I took my acoustic guitar along. Playing in my room at around 7:30 at night and I get a call from the hotel management. Someone has complained about the noise. I am like, at 7:30pm??? Turns out they were in from Japan or some place like that and were on a weird time schedule. Not my problem as far as I was concerned but I had to stop my practice, which is why I brought the guitar... didn't want to not play for the week.
So my wife bought me a travel electric guitar which I can carry on. The case meets all the dimensional requirements for a carry on, i.e. 42" in in total length and depth and it generally fits on top of the all the carry on shit that folks bring to stow in the overhead bin on airplanes. It has active pickups and a headphone included. So it became my own way of keeping my "hand in" and practicing, it meets the bill. Pretty quiet though for others to hear but my target was practice not sing alongs or trying to play for other people. The guitar is not that great, i.e. could use a setup that I haven't got around to for the action, etc. but it gets the job done. Strangley, it is kinda fun to jam with the weather channel during the radar when they play jazz and sometime Bruuuuuce Hornsby tunes, etc. Recently I bought a micro amp that can clip on my belt and I stow in my suitcase so I can get some small amount of volume out of the rig. Not great but it is something. It doesn't quite compete with an acoustic when playing with others as I have found out while here on vacation in Hawaii (visiting my daughter). But it does ok. Biggest issue is it is a Marshall

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So enough blather, just wanting to tell the tale and check the perspective of what the goal is for traveling on visits/vacations. I take it when we drive to visit my other daughter at college, again to have it to practice with and now can somewhat jam along with an acoustic if the opportunity arises.
Probably not worth $.02 but what the hell.
Dave