I am not sure I fully understand the Mosaic program, but compared to United or Delta, JetBlue's Mosaic seems pretty poor. I wanted to get on an earlier flight from BOS to SFO recently. Traveling in Mint. Went to the gate 1 hour before the departure time and said I was Mosaic in Mint and wanted to switch to this flight. He confirmed there were seven open Mint seats, so plenty of room. But he said that I must go to the "Just Ask" desk. Gate agents cannot do stand by, same day change or whatever. I went to the Just Ask desk, and the line was 20-25 people stretching well back into the corridor. While in line, I also called Mosaic phone support to see if they could help. 30 minutes later, I was still far from getting help at the airport, and was still listening to music on the phone. Another 15 minutes later the flight I wanted to get closed so I missed the opportunity. Still waiting on the phone at that point so hung up on that. Another 20 minutes later I finally was able to talk to a Just Ask agent and asked if Mosaic meant anything to them as far as help or service. They seemed sympathetic, but said that Mosaic does not provide any special priority in terms of getting assistance at the airport. The agent said JetBlue was very poor in this regard and did apologize. I wish JetBlue has some special help for Mosaics similar to what United or Delta provides.