Originally Posted by
DCFinanceinFlight
JFK may be an issue since they only run CRJ 50 seaters between IAD-JFK.
Easiest way to find a valid routing is to buy a dummy ticket. A quick look shows both JFK and DTW as an option to buy. You may have issues with JFK for reasons I posted earlier.
Being able to buy a ticket doesn't mean anything. It can be a broken fare.