Just to add to what the other comment described, I'll say that your first day will consist of training (basically an airline-mandated powerpoint and you have to pass a super easy test within two tries) and site tour. If you finish that early, you might have a brief time working your position. This is when you will learn what department you'll work. If you're ramp, then the second day will be training specific for those working ramp. Unlike the other commenter's facility, mine does not rotate between departments (but you can apply for an internal transfer after 30 days).
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One good tip is to buy a non-metallic belt. I've worn this belt since October last year and both of them still look like new (one of the combinations you can select includes one metal buckle belt, so watch what you add to your cart).
1) Pay is weekly on the night of Thursday into Friday (I usually get it deposited around 1-3am).
2) VET and VTO opportunities highly depend on your shift (night v. day; front half of the week vs back half) and the volume you process and staffing needs. In the 8 months I've worked nights at the same facility, it has run the gamut from full-shift VTO available almost every night from late Oct until just before Black Friday and again from mid-January to Mid-March to VET offered almost every night from mid-March (when the days and times of the shifts changed and increased from 8 to 10hrs) to late-April when we were really understaffed and the volume significantly increased for night shift. I don't have time right now to go into details of how the flights and other factors relate to VET/VTO opportunities.
3) Composite toe shoes are required for all employees, regardless of what department you work in. If I recall correctly, I was told it was because the metal ULD containers that are loaded and put on the aircraft weight something like 500lbs empty and vary in size with the largest holding several hundred boxes. You can't wear steel toe because you go through a metal detector every time you enter the building, so you have to get composite toe shoes. Where I work the main breakroom is outside the secure area so I have to go back through the metal detector after both breaks...so 3x a shift! I strongly recommend buying a non-metallic belt. I purchased this two-pack for $14 in October. I wear one of them every day (both to work and elsewhere) and both are in like-new condition. Also, the metal detector screening isn't as bad as the TSA at passenger airport terminals. You can hold metalic objects above you head. A security guard is always watching as people go through to see which area triggers the metal detector. It will light up at the top and since no where to conceal anything around/above you head, the items in your hand are what triggered it. I use mostly debit card now so I don't have to worry about change in my pockets.
4) The differential is tied to your shift, it doesn't kick in at a particular hour.
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Lastly, you aren't necessarily working in sort...it depends on when the aircraft arrive/depart and what the other shift times are. I don't have time to type out a detailed explanation, but if you mention where the facility you applied to is, I may be able to give you a better idea.
KAFW is one of Amazon Air's newest facilities (opened 2019) that functions as a sort center. Most Tier 1 employees will be inside the building in the sort operations. I work at an almost identical facility in Florida and most management and trainers went their to get experience before we opened last summer. Only a small number of Tier 1 employees are sent outside to work on the ramp (working on the ramp requires extra training, so those working on the ramp will never work outside (unless you get an internal transfer and go through the additional training). First day will be in training room sitting and going through airline safety training. You'll be emailed a code to get composite-toed shoes on Zappos. YOU'LL BE ON YOUR FEET ALL DAY SO GET COMFORTABLE INSOLES!!!! Also, buy a non-metallic belt (I wrote about this belt in this post answering Amazon Air questions) as you go through a metal detector entering the building. I also don't carry change anymore and just use debit or my phone, so when going through the metal detector I always have the same 3 metal items (keys, phone, watch) and don't have to think about what metal might be in my pockets on on me.