Junior 777 FO is 11,781 (LGA). Junior 330 FO is 11,945 (PHL). Junior 737 CA is 11,082 (LGA). There are about 14,500 pilots on the list. If you bid 737 FO to 777 FO, there is no seatlock to bid 737 CA. So you could try out the 777 and if you don't like it, bid 737 CA.