Travelers in my area starts by putting out ads for applications, then when turnout is not high they have frequent Job Fairs. I applied through the website and didn't make the cut, went to the job fair a few weeks later and did.
Job fair: you sit and wait. They do an initial interview. If they want to move forward you test. Tests are all on computer and super easy. You can use computer's calculator for math (just make sure you know how to figure out percentages) and then a simulated call center experience where you listen to simulated calls and pick what you would do. And then a behavioral test - Word to the wise, answer it honestly at your own peril, for every question, just ask yourself: WWJD?
After passing all that they call you back for an interview. This is where you want to sell yourself hard. This is a Fortune 500 company. You want to be confident, friendly and jovial. Present yourself as someone they would look forward to seeing every day in the break room and having good small talk with. But it's all behavioral based questions, I.e. Tell me about a time when you . . . So prepare with plenty of examples of when you multitasked, handled irate customers, worked under pressure, provided excellent customer service etc. and in those examples show how much you shined as an exemplary employee.
Most of the questions, interviews and tests are there to show that you're smart enough to know how to answer the way they want you to - not necessarily answer honestly. They are looking for Yes-Men. So if you need this job, be what they want.