It will be in the contract because the union has no say in how UPS runs their operation. If UPS wants to deliver 24/7 they will.
Yes they can and yes they will. If 24/7 means more money, its means more jobs.
I feel like a lot of people don't get this, that the union can't (and shouldn't) tell the company when they are allowed to do business. Company makes business decisions, Union makes sure that workers are treated fairly and compensated for their labor.
Its not about the business of the company. You are right, its about the business of how the company treats the workers as these changes are made.
But, as always, when changes are made, the company has always had the attitude of we have got a blank page here and we will do what we want.
You want the company to make money and money making decisions but,history proves, get it in writing, or you will open a door you cant get closed.