So sorry to read the letter.
It is obviously what we all dread after being told we are sucessful.
The airline business is a very volitile one, indeed operational requirements do change however, good carriers usually wear this and do not lay off staff if they can help it.
I do hope you can still remain at your bank position and are not out of employment.
I feel you will find what has happened to you is for the best.
You WILL find another Cabin crew position that is even better suited to your requirements and soon!
Mark my words... spooky old psychic