Tell him this is YOUR plan, unless he can come up with one to meet or beat it...your plan will go into play on X date. Come X day I am BOOKING the NON REFUNDABLE flights, and we will be committed so, you have till X date to show me a better way.

Follow it up with a "you know how much I love you, but I have worked really hard on this, and you have made it seem like I just threw money at it, and picked the first thing that landed on my plate. I DARE YOU to do it for 1 hour. Then come back and tell me to book the flight.

I want us all to have a good time in a place you have dreamed about. This is the best, final option I can come up with unless you want to drive, sleep in tents that we pitch on the side of the road on the way, and eat out of dumpsters. Its up to you now. Fix it or tell me to book it.

Then...go pick up your book and rest.