Love the Mayair. I would suggest you DON'T use the online booking, but instead email them. I was getting the best price via chat, but I just booked Mayair in February and while the chat price was better than the website, it wasnt that good. I emailed and got a better price and booked. It is way simple.
We commonly do: CZM to CUN.
1. Negotiate the tickets.
2. Show up 30 minutes before the flight.
3. Bring the credit card used, so they can inspect it.
4. aggregate all your groups bags on the scale, including carryons, as there is no overhead storage. Try to keep your total under the total combined allowance. If over, negotiate.
5. Fly over. Allow a little extra time. I was taking the Mayair at 1100 from Coz for a 1240 flight at CUN. I made it several times, but it was WAY too close, so I am more careful now.
6. In CUN you go to the new small FBO terminal. Wheel the bags in and hand them out. Then you board free Lomas shuttles to your terminal.
I have done CUN to CZM when airtran cancelled my flight. For that:
1. Exit CUN customs and out of the building.
2. Find a guy in turquoise shirt and white pants. This should be a Lomas guy, some how part of the Mayair company.
3. Tell him you need a van to Mayair and he will get your free transport arranged.
4. If you are waiting a while, bring your own snacks. I am not sure of the new FBO, but the old waiting area had like one soda machine? Maybe a snack machine?
5. And of course no customs in CZM, you already did it.
Oh and there is a free bus in the airport from terminal to terminal. Don't use that, get a Lomas van.
We did sit on the Mayair plane on the runway a while in December. They did announce why, but the RPM were up and I could not hear why. I have heard of the occasional mechanical delay, but none of that is really any different than a big plane.