I think you misunderstand what they mean, it's not moving trips from one base to another. From my understanding global reserve is when you only have 3 days left on reserve, but scheduling needs to fill a 6 day trip. The company can move reserve days from later in the month and viola you now have 6 days available, have fun on your 6 day. In 3 years on 330, I have never been worked more than one day into my off days. That one day was only because DTW shut down for half the day.