It is the same year the lettertype became what we know today. But the logo wasnt even lightblue untill 1991.
But most importantly, showing the KLM part would be telling wouldnt it. Ofcourse they wont show that part.
Your comment is like saying for the British Airways; As far as I can remember it has been "British Airways" blue letters against a white background. yes the name is included in the logo, but the name IS not the logo.
I've flown a fair bit but never knowingly seen a Southwest plane... I imagine if I'd spent more time in Burgerland I would have. (/joke ;)
Actually "NZ" for all quizzes containing New Zealand please.