You don't need a cover letter.

I may not need one but i doubt it hurts.

Sure, if you want to waste your time. It's not one of the documents listed in the attachments section of pilotcredentials either.

Nope, but there is an "other" option.

Unless they specifically ask for it, there's no point in sending documents they don't need. Attention to detail is important.

and so is making yourself stand out from the thousands of other generic applications.

That's not how the hiring process works.

Maybe not, and I guess you have it figured out since it appears you work at AA. Would it honestly be negative points though?

Also please share more information on how the hiring process works. Is it strictly a numbers game then?

Mine said "To whom this may concern".

I also uploaded it to the "other" section as you mentioned, printed it out along with a resume at Women in Aviation to hand to the recruiters, and had it on hand during my interview as well.

I was hired and although I'm sure it wasn't because I had a cover letter...as you also mentioned...I'm sure it doesn't hurt.

Good luck and have fun! :)