More random trivia. Runways are not strictly named by their magnetic headings.

Chicago O'Hare has so many east-west runways that they have "mis-named" some of them: (see 10L/28R and 10C/28C, both of which are on magnetic headings of 93/273. And yes, they have a 10-Left and 10-Center, but no 10-Right. :))

http://airnav.com/airport/ORD

Sounds like a side effect of the magnetic north movement. It has drifted east (in relation to the US) about 6° in the last 30 or so years, so if Chicago hasn't re-named them since laying them down, a compass alignment of ~100° becoming 93° makes sense.

No, it's the effect of having more than 3 east-west runways. 9L, 9R, 10L, and 10C.

The sub-names (left, center, right) only go up to 3.

Detroit Metro has the same issue with their SW/NE runways (21L, 21R, 22L, and 22R are all mutually parallel.) http://airnav.com/airport/dtw

Atlanta Hartsfield has 5 runways, all aligned on 94.4*, named 8L, 8R, 9L, 9R, and 10: http://155.178.201.160/d-tpp/1405/00026AD.PDF

10R is actually under construction and will be open around October 2015. =)

When I started flying, my home airport had runway 09/27. A few years ago, it got repainted as 10/28 because of drift. Some people still slip up and call it 09/27 by accident.