Upon completing the online application on a Friday, I was immediately prompted to schedule my initial interview/tour of the facility where I'd be working if hired(the Philadelphia Air Hub), which ended up being the following Wednesday. In preparationi for the tour, I was told to wear boots. Although they did let people without boots into the facility for the initial tour, they aren't that lenient if you're actually hired. Wearing boots to the tour saved me the trouble of buying a new pair, since it gave me an opportunity to ask someone who worked there if the ones I already owned would be suitable for the job(they were).
Also, items prohibited from being brought into the facility include cell phones, ipods, and other small electronics. Before you get to the facility, you pass through a guard station with metal detectors, and outside of the guard station are lockers where prohibited items can be stored if you don't have a car to leave them in (but you have to bring your own lock, and the lockers are available on a first come, first serve basis).
Though they asked us to be there at 9:30, the actual tour wouldn't begin until after 11 PM, when the "midnight" shift (the shift for which I applied) was starting.
Before the tour, we were all taken to wait in a classroom(one of the ones where training would take place if we were hired), where a UPS trainer came in to give us an overview of what the job would be like-- essentially, the purpose of this speech was to scare away anyone who wasn't prepared for the hard work, union fees, working late at night, etc.
Once package operations began, tour guides arrived and took us in groups of five to tour the facility. After the tour, they brought a sign-up sheet to the classroom so we could schedule 1-on-1 interviews.
My 1-on-1 interview was the following Tuesday afternoon, at the employment building located up the road from the air hub facility(so it wasn't necessary to wear boots or leave electronics outside). They reminded me ahead of time about all the things I would need to bring(e.g. forms of identification) EXCEPT ONE-- the login info for my online application. You need to log in to your application in order to complete the pre-employment paperwork they give you during the interview. I couldn't do that because I didn't recall my password, and when that happens, the only thing the site can do is send you an e-mail with a link in it to reset your password. At first, I couldn't even get to my hotmail account because the computers at the employment building aren't set up to browse the web. Then once someone there got me onto the web, I still wasn't able to follow the link to reset my password, because of some other restrictions on the computers which the HR people didn't know how to undo. So as a result, I had to wait until I got home later that day to log in and complete the paperwork there, then call HR back to let them know I'd completed it.
The actual interview itself was simple and easy-- apart from confirming my contact information, all that was really asked was why I wanted to work there. There was some paperwork that I was able do without logging into my application(e.g. signing up for the union, consenting to be fingerprinted), and at one point I was called into another room to get my fingerprints scanned. After finishing the rest of the paperwork at home, they called me back that Thursday to let me know I was hired, and to come in to start training the following Monday at 9:30 PM.