You can pretty much fill out the register while the cashier is ringing up your items, except for the amount. And you typically don’t need to fill out the check anymore. They just scan it to get the routing and account numbers, and hand it back to you.
A while back, the local convenience store chain around here had a sale on Kraft mac & cheese, 2 for $2, or $2.29 each. In one store, I saw a sign on the display they had set up saying “It’s a no-brainer!”. I wonder how many people bought a single box.
I liked Frontier last time I used them, in the early 2000s. They had nice planes and friendly staff, and were generally one of the cheaper options.