AWWW!!! I LIKE YOURS!
And I totally concur on the leaving out the court talk. Just stirs the pot and gives her ideas.
I had thought of a funny, confrontational email too.
Dear Ex,
When I had planned flights for our daughter back in February, I thought we both understood what the times were.
If you want to change the times on the flight, its $100. You can pay it.
Or you could take the $100, and get a babysitter. Or buy your boyfriend some dinner and a twelve pack, and maybe he'll stay home with YOUR kid.
Or take the $100, and retain your lawyer, but you're gonna need more than $100 when you have to pay mine too.
So, you decide.
Love ya!
Me