Death In The Clouds by Agatha Christie

From seat number nine, Hercule Poirot is almost ideally placed to observe his fellow air travelers on this short flight from Paris to London. Over to his right sits a pretty young woman, clearly infatuated with the man opposite. Ahead, in seat number thirteen, is the Countess of Horbury, horribly addicted to cocaine and not doing too good a job of concealing it. Across the gangway in seat number eight, a writer of detective fiction is being troubled by an aggressive wasp. Yes, Poirot is almost ideally placed to take it all in--except that the passenger in the seat directly behind him has slumped over in the course of the flight ... dead. Murdered. By someone in Poirot's immediate proximity. And Poirot himself must number among the suspects.

Exotic methods
killed in front of witnesses
no one saw a thing.

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...

variation of the themes. No-one sees the servants. Girls fall in love with murderers. Hercule Poirot is everyone's grandpa. I don't care about the one killed.