I have had several supervisors who have said that the next day air and the ground for the same address are different stops. The NDA has its commit time and the lesser service levels have later commit times. Now which is going to add to your dispatch, delivering everything at the same time or retracing miles and an extra stop? If you want the most out of your day then take the extra work when it is there.
I agree there are exceptions to this rule and I treat them the same as most others. Generally, if there is a large bulk stop that there are next day deliveries for, then I deliver it all at the same time. I usually don't have the time to separate the air from the ground. BUT you could..........
It is not so much about the extra stops it is about the extra time and miles that you are paid for. UPS allows us to treat the next day air as its own stop.....because it is the premium. You are not padding stops or miles when you deliver the ground on your usual trace.
Just work the parameters set by UPS to your advantage. AIR and ground are separate stops.
EVEN savers have a different commit time. Think about that one.