C Checks.
And it's hilarious to read the can on the first revenue flight after its return. I've taken three of them on their maiden revenue voyage now, and let's just say it didn't give me the warm fuzzies.
You read about how ATL maintenance "robbed" half the parts from the plane before it left, then how ExcelTech cobbled it back together. And the airplanes end up having all kinds of "bugs". Just stupid things that don't work like they are supposed to. Of course, then there was 636 which spewed out oil until it caught fire on day on the ATL ramp, but that one wasn't mine.