Death In The Clouds

It had been far too long, so I had to throw in another Hercule Poirot. This is number 12 in the series. 
This mystery starts with a murder on an airplane. An old money lender is seemingly struck with a poison dart and dies instantaneously, not being discovered until the end of the flight. M. Poirot, who does not do well in planes, was trying to sleep through the indigestion. 
This wasn't my favorite, I'll be honest. It technically happens on a flight from France to England, and yet the people involved keep running into each other even though some of them aren't even from the same country? It just seemed to fit together too neatly for me. After the inquest they were all allowed to go wherever they pleased and yet it kept happening? 
Poirot is up to his usual antics, which is of course why I read these, but it did feel like she simply made up the ending. The clues and hints were simply not there for me. I like being surprised, and I like twists, but I do prefer when the information presented at least COULD point to what is true. And I felt as if it didn't. For me that's mostly what was lacking. 
Personally still a 3/5* for me. I look forward to number 13, as it's the ABC Murders...