I won't get into specifics, because the story is too long, but when we were in Russia we took an in country flight and it was supposed to be on Aeroflot. Now everyone makes fun of Aeroflot, but every Aeroflot plane we flew on was brand-spanking new and the nicest I'd ever been on.
We walked out of the airport waiting room to catch our "shuttle" (more like a cattle trailer) to the plane out on the runway and as we got closer, I realized it WAS NOT an Aeroflot. Not by a long shot. It was.....Heaven help me......Ural Airlines, which has the WORST safety record in Russia. DH was not aware of this, but I was. They crash and have all sorts of problems. But it was Russia, and we couldn't run screaming back to the terminal, refusing to get on. You just don't pull that kind of stunt there. Plus, no one in sight spoke English. They almost had to shove me up the stairs to the plane.
I cannot begin to describe the condition of that plane.

I've been on better looking buses in the interior of Mexico. No seatbeats, collapsing seats, springs poking through seats, nails halfway hammered into place. Only an overhead "rack" which was a shelf with
nothing....not even net...to hold in all the luggage shoved up there. If we hit any turbulence, it was going everywhere and we were all dead meat. Forget pressurization. I thought my ears would explode.
DH looked at the safety instructions, which appeared to have chewed by a rat and started to read them. I just looked at him, shook my head and said, "I don't know why you are even bothering to read that. If this plane has one minute of trouble, you can kiss your *** goodbye." After that, we referred to it as the "Kiss Your *** Goodbye Flight."

It was the scariest flight I have ever been on and I'm no scaredy cat flyer. The return flight was on the same airline, different plane, but it was in just as bad a shape.
A few weeks after we returned to the US, the State Dept. issued an advisory telling all US citizens to not fly on Ural Airlines. They were too unsafe. No duh.