Originally Posted by
bocastephen
I can't speak for Delta, but I've skipped this process every time while booking tickets on Continental and so far nothing has happened with the airline or at the checkpoint.
This is because CO probably does not have to transmit the SecureFlight data collected to the TSA yet.
However, once they do, then without the SecureFlight data, you won't be able to check-in either online or at the airport until you provide the information to a ticket agent.