Checking bags this afternoon at MSP in Sky Priority lane. There is also a Delta One lane. Two agents working, after 30 min of no one in Sky Priority called to counter the gentleman in front of me went to counter to ask why no one from Sky is able to check bags. He was told that until Delta One line is empty no Sky Priority. Later, a red coat came and opened a spot and when I asked him how Delta One vs Sky works, he informed me that Delta One passengers pay a lot to fly so others need to wait. I am just platinum but the guy in front of me had a 2MM tag, the other gentleman was polite but annoyed as were the 15 other people behind us in line. Is this really the protocol?