I hand wrote my application, neatly of course. The application actually gives instructions on how to fill it out; strongly suggest you read it & then follow it. Many people have typed their answers which is OK, but you don't have to. ATA is not a paperless cockpit and like most airlines, they require a lot of report/logbook writing, so they like to see what your handwriting is like. The main thing is is it should be legible and the answers fit within the spaces provided. They should also be succint, keep in mind that it's not always what you do but HOW you do it.
You don't need any recommendation letters or references to be sent with it - that's for the interview. Depending on your schedule and how good you are at filling in applications, you want to take some time in completing this one. I took a full week to do mine but you don't want to hang on to it for more than two weeks.
Sent mine certified mail which is cheaper than the express (& doesn't make you get an interview any quicker!) and got a signed receipt back some two weeks later.
As for interview, that's the crap shoot; heard some have got it after 6 weeks, others 4 months, and some even have been waiting a year or more! I've been waiting almost 4 months now.
Finally, if you want to follow up, whatever you do, DON"T call them!! That = kiss of death. Get your LOR to do it for you. That's how the system is set up. Best of luck.
757driver