Mystery Solved

Okay, maybe I should have done some more research before my last post:

sked /skɛd/ Pronunciation Key - Show Spelled Pronunciation[sked]

–noun Informal.

an airline that maintains a regular schedule of flights.

[Origin: 1925–30, in sense “schedule”; by shortening and resp.]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

But still, "sked" shows up as a misspelling on my spell-check, so it can't be a real word, right? And I looked up "skedded" at the same site, and there is nothing. Also, I thought only verbs could end with "-ed", not nouns. What the hell is wrong with this world?

I'm such a word nerd.

Rob