I would hope that they are washed frequently, like daily.

It's seems the passengers who get stranded get those ugly grey jail blankets while those IN the plane get the nicer softer blue ones.
I remember being given a jail blanket when I was stranded in Pittsburgh. It did not look clean, and I only sleep on down pillows so
I turned my jacket into a blanket and my
hat into a pillow and laid out on teh floor.

It was after then that I signed up for HIlton, Marriott Sheraton and Westin's Frequent guest programs. I will NOT be forced
to sleep in an airport again! CATMAN