I don't care so much for pedantry. Language evolves and changes; 'tis the nature of the thing, and there's a sort of tiresome "Get off my lawn!" attitude that comes with people who get hugely upset by that change. Chaucer's English is barely recognizable as the same language as modern English -- words change meaning, are removed, added, morphed, mushed together, and torn apart all the time.
I mean, seriously, of course there is such a word as 'deplane' -- just because one dislikes it doesn't mean it is not a valid word. I know what it means to deplane, and most English-speakers will also know it's meaning; it certainly seems to fit the criterion for being a word. Whether or not a word is a word is not limited to it's appearance in a certain edition of a specific dictionary! What a dull world it would be if language was static.
I am also especially fond of portmanteaux. They are a fun and funny way to play with language. The most recent one I heard that I like is "sexposition" -- a term describing the tendency for characters in "Game of Thrones" (which I still haven't seen, I just read an article about it) to remove their clothes during long, expository scenes, in order to keep the viewers watching.
I myself become pedantic only in the very specific circumstance where a word is so badly misused that it obfuscates the speaker's meaning, like using infamy
when one really means fame
, or when the misuse of the word means losing the only word in the language that has that specific meaning, for example, using disinterested
when one means uninterested