Originally Posted by
Mr.Nuke
More than likely its a reminder to identify themselves as "Continental XXXX, United colors" on initial radio contact.
Correct. At the gate in Aruba on Monday I was chatting to the Captain and First officer waiting to take over the flight back to EWR and they said that when flying the new colours they had to let ground/tower/ATC know that it was a United aircraft albeit a Continental call-sign.