Is this a problem with the charters? As good as they are, there is no recourse for luggage?
Could be.
On the other hand my friend forgot his Teffilin on a Lalechet plane. He called them up and they located it and sent it with someone to yerushalayim where he picked it up.
B"H I have no experience forgetting things on a plane but I imagine it would have been much harder had it been forgotten on a commercial airline.
ETA: I one time forgot a small bag on the plane. I realized pretty quickly after I got off so I went back to get it. There was no one at the gate or by the jet bridge so I just walked right onto the jet bridge. I got about half way down and I bumped into the FA and Pilots coming off the plane. They asked me where I was going so I told them I had forgotten something and was going back to get it. They told me I better got off right now because it was against the law for me to reenter the jet bridge and I will be arrested and if I don't get off immediately. One of the FA went back and found it for me.