Airspace scares become the norm

I was a little surprised at the media circus that resulted in the plane that flew into restricted airspace in the capitol earlier this week. There wasn't nearly as much attention when the same thing was supposed to have happened last week. I tried to find out what exactly happened last time...but don't go to Scott McClellan for answers:

MR. McCLELLAN: Sure. And I think the Secret Service has talked about it, as well. There was a report, or an indication, that an aircraft had entered restricted airspace around the White House, and so there were some precautionary measures that were taken. It was quickly learned that it was a false alarm and that all was clear in a very short amount of time. And everything is fine.
Q Was there, indeed, no plane? Or had the plane been cleared?
MR. McCLELLAN: I think the Secret Service is still looking into that, so you might want to talk to them about that matter.
Q They give a one-sentence thing and say they can't comment beyond that.
MR. McCLELLAN: I'm sure if they have additional information, they will be glad to provide it. But the last I knew was that they were looking into it to determine exactly what it was.

From press briefing on 4/27/05