I remember about 5 or 6 years ago that President Clinton flew to CMI to give a speech at the Univ. of Illinois. It had been raining all morning and when USAF1 was taxing off, it made the turn too wide (at least for the airport which is configured mainly for turboprops and rjs) and the front gear got stuck in a giant mud pit. After about an hour of trying to get the plane moved, they brought over some stairs and the President got off and went to make his speech. However, since they couldn't get the plane out, they dispatched a second aircraft as a precaution in case the first was unable to get out of the mud by time the speech was over. Luckily it did get out of the mud, but after the spare had arrived I believe. So, I guess that's a good enough reason to have an extra one lying around.
Here's an article about it if anyone really
cares, however they refer to the plane as being a 707. article
United 717 heavy, you're facing the wrong way. Any chance you can powerback to get off of my deice pad?