Dear Colleagues instead of just Ladies and Gentlemen (no ampersand) but that is MOL for you
I don't think you are not colleagues of your boss.
Ryanair is a successful airline that have been doing their work well. Like most organisations it has a few school yard bullies that act as if they were forced to join the airline and have been held there against their wishes. If things are so bad and they can't make ends meet and the glass is always half full etc etc, why don't they just leave? I for one would prefer not to have a disgruntled pilot in charge of any aircraft I fly on. Remove them.