We departed from Omaha on AA, did the check in on line and got our boarding passes. When we got to the airport to check our bags we were asked for a copy of our entry forms. I politely explained that there is no print option on line, however I did take a screen shot which I handed to her. She said it is required and couldn't let us the plane without it. I think she's wrong but no point in arguing as I had it.
When I filled them out, I did mine first and thought it odd that when I was done there was not a print option so when I filled out my wife's I did a screen print before I got to the last step to accept it. I went back to mine to edit it, with nothing to edit but for the purpose of taking a screen shot of mine. Thankfully I did. While most here will agree it's not required and the gate agent was wrong, there's no downside to having a copy.....just in case.