I bet the sixth is
RARE GARDEN which is an anagram of REARRANGED. (Note that GARDEN is an anagram of DANGER.)
Perhaps each of the six things is
a word describing a means of transformation, transformed by that means. So e.g. one might be CAESAR with each letter moved forwards three places: FDHVDU. Alas, none of our things seems to be that, nor does it look as if any of them is likely to start with any shift of CAE. (If our Malaysian airport is JHB and our Scrabble letter is J, a shift of 2 yields KICK IT; if JHB and Z, a shift of 19 yields CAUSAL; I think these are coincidences. I haven't explored Caesar shifts of anything else.) ... Dan's recent edit indicates that actually the airport probably isn't JHB.
In comments MOehm finds that
if we take the Malaysian airport to be ZGY and the Scrabble letter to be Z, we get ATBASH atbashed, which seems like confirmation for this theory.
A few other notes that haven't led me anywhere much so far:
The Malaysian port airports seem to be: ZJT ZMK ZJR ZJB ZGY ZLW ZWR. Presumably the last two letters of #2 are IN. I agree that #3 seems to be SOSTHINK. Perhaps with a bit of stretching the Roman coin flip in #4 could be ALEA (CAPUT AUT NAVIA seems too long). Or maybe it's a Roman coin name backwards; SA, perhaps. The "final thing" has a lot of structure to it; it looks as if the letters come in pairs, suggesting maaaybe some sort of 5x5 grid, but then it's surprising that we have both I and J. Perhaps the grid is missing Q or Z. Or perhaps it works in a completely different way.