Ok. First off, you are guaranteed 3.5 hours, BUT, if you look at the next kine under it, it states that if you work 3 hours, you are then guaranteed 4 hours. So ultimately, you are guaranteed 4 hours regardless. The moment you hit your 3rd hour, you are then guaranteed 4, so you make sure your B.A. and center managers are clear on that and that it is enforced or you better grievance it. It's in Art 40. When you read the guaranteed 3.5 hours, don't stop there. Read the very next sentence which states you are guaranteed 4 hours, once you work 3 hours. This has been overlooked by just about every air driver and Union rep I've talked to.