Online Travel Booking and Bidding Agencies - Booking websites - how can I specify layover?

I have a trip to Dayton Ohio next week (out of Harrisburg PA). On my return flight, I'd like to have an extended layover in Cleveland. Just by luck I saw on Expedia a Continental flight through Cleveland, but it was only for an hour. I'd like to meet a friend for dinner and catch a later flight.

Are there any websites that have that kind of search criteria, or do I have to call an agent?

TIA,
~Kar

Try booking this as a multi-city flight, with the time of each flight specified. You may have to pay a lot more for the privilege (or not).

Most (all?) airlines call anything less than 4 hours a "connection" and anything more than 4 hours a "stopover" on a domestic itinerary. Ignoring fare bucket availability for a moment, generally, a "connection" will not add to the cost of a trip, while a "stopover" may add significantly to the cost of a trip.