I guess what I said needed a little more elabornation. You are seat locked as an FO in the airplane you are in until upgrade (which if your seniority number is up could be right away but right now is fall '07 seniority) or until 2 years then you can change FO seats. You can change bases freely as an FO as long as the aircraft you are on is in that base. The Saab and 900 are in MSP, DTW and MEM which means you can move around as much as you want on the same aircraft as long as there is a vacancy and your seniority can get it. But the 200 is only in MSP so you can't change bases without upgrading to an airplane that is in the base you want or 2 years and you can switch FO spots to the aircraft that is in the base you want.