I'd have to ask my wife about the paycheck as I haven't seen what one looks like in 5 years, but the ID says "Endeavor Air Delta Connection" with a Delta logo on it, the back it says:
Property of Delta Air Lines, INC.|
And gives an address in Atlanta Georgia.

Again, not an employee for Delta. But we are a Delta subsidiary and are still in active service for Delta Air Lines. A retiree is not.