awaters, if you are going to be using BWI, leave the knives at home. BWI is rather paranoid about their security, on top of the fact that they are one of the premier testing grounds for all of the new gadgets for making us safer in the friendly skies. Even with checked bags, I would be hesitant to leave a knife in for fear that it would be lost upon being checked over by security. In these times they've been given broad powers to do searches and, as they are private property (at least I believe BWI to be), they are given even MORE power to act on their own property. Best to think of the airports in the Baltimore/Washington area as hostile knife territory. The laws outside the gates of the airport mean exactly squat INSIDE the gates. Not that I advocate such paranoia, but just letting you know. The last time I went to BWI (which was about 2 months or so ago), they were really hardcore about the security thing. If you're going to take a knife, take something you don't mind losing.
I believe the VA blade limit is 4", and the MD is probably 3.5" (with city ordinances being somewhat more restrictive). The BM Grip should be within the limits, but NOT at the airports.
Just my .02
Sincerely,
Anthony