If you got the spaces right, my "length field" theory doesn't work (first one would be missing 4 spaces at end, 2nd and 4th one would be missing 1 space before TKG.)

But you have FASTX where I had FASTR, that might be a hint that this is "FAST" + "X/R" as 2 separate things. It's also starting to feel like a real mystery with whatever "FAST" "FBAG" "KEYC" could be

On the plus side I'm gonna be flying AC in about 10 days, their ultra long extra data seemed interesting too. Wonder if I'll get "AC 813" again