Originally Posted by
james318
In the past, Pre-check has not been opened at that time. I'm sure the results on if that is true are published out there, but I'll leave that Google search to you. Clear has been staffed. Sunday morning should not be terribly bad at that time. The Skyclub opens at 4:45 if you have access to that. Otherwise, it's a pretty miserable time to depart DFW, but one I've done many, many times with no issue.
If no specific Precheck they use the "block" so that both Precheck and regular passengers can use same xray. The separate lane to ID check is always open. (Don't need to wait in longer line)