Passengers Boarding At Gate 39
So my family picked up our luggage and carried it over to Gate 41. Not ten minutes later the public address voice told us that Flight 404 would in fact be boarding from Gate 42.
So, again, we gathered our carry-on luggage and returned to the original gate. Just as we were settling down, the public address voice spoke again: "Thank you for participating in Delta's physical fitness program". "I hope you have a nice day".