The email from the generic flight crew email address doesn't mean much. You should receive an email directly from an HR person to confirm your documents are in order. I got the generic documents received email also, but I was missing one document and would not have known this until I was contacted directly by a person from HR to submit the one extra document... upon doing so, I received a reply a week later saying everything is good and to expect an email from a different HR person within the next month regarding interview dates.