Jim Macklin wrote: brevity snip

Before take-off, airlines spray boiling hot water on the
airplane (180° or so) to remove the snow and ice, then they
switch to a heated mixture of water and anti-freeze to keep
any ice from accumulating on the airplane during the time it
takes to taxi and take-off. As rain/snow fall on the plane
and melt, the antifreeze solution become diluted and the
water will begin to freeze in hinges and such.

Light frost on the aircraft prompted our pilot in SLC to de-ice.
One plane ahead of us: total delay ~45 minutes.

http://i16.tinypic.com/4gr9p8n.jpg
http://i10.tinypic.com/2rcu9sh.jpg
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- gpsman