Sorry for poking my nose into this, but the problem Merdaneth spoke of is one I've had problems with as well. Anway, three ideas for your consideration.
1. Locater agents, or however its said. Honestly, I don't know how good those would be, I've never used them much myself, but I think they can track people when they are actually flying around, right? Downside is they can get expensive.
2. The OOC route. Have the two fleet commanders have a channel open between them, and have the attacker say something like, okay we went through Jita five minutes ago. You could say this is from something like the Amarrian navy passing the word up the chain of command to someone who called in the capsulers.
3. The mostly IC route. Have the attacker tell the defender when the op is taking place, and leave it up to the defender to organize scouts or anything else needed. Actually, with a combination of 1 and 3, you could probably get away with only knowing a general time.
Anyway, my crazy ideas for the day.