I think FedEx has around 6,000 apps. This was from the chief pilot a few months ago. I can't remember the exact number he said, but I know it was definitely under 10,000. You have to check boxes stating that you meet all the mins before you are allowed to fill out the app. So unless some people are lying all applicants have at least 1,000 TPIC.
I think when SWA opened their window a couple years ago they had around 8,000 apps.