Hydrogen Leak Postpones Discovery Launch
Space Shuttle Discovery Launch Postponed to no Earlier than November 30, SpaceRef
“NASA has decided to postpone the launch of Discovery to no earlier than November 30. This is a result of the hydrogen leak that occurred early in tanking of the shuttle external tank. It turns out there also was a crack in the foam of the external tank.”
Keith’s note: There are lots of NASA planes headed back to JSC and Stennis/MAF right now (see FlightAware)