The Qaddafi regime has stooped to ordering in airstrikes on the protesters and army renegades who are supporting them in Benghazi, but not all the pilots are willing to bomb their fellow countrymen.
The talk today at the U.N. (and other venues) is of a no-fly zone over Libya, but the why and how of that are still openly being debated. To keep out mercenaries and supplies to the regime? To shoot down any Libyan aircraft being used against the area in revolt? To prevent Qaddafi and fellow goons from making away with their loot?
If the call is confirmed by a UNSC resolution, it pretty much requires an American intervention. Naval air is available and in-region... but is there the political will in Washington?