Hi

Does anyone know of an online booking engine that allows you to book a multi-stop itinerary with segments of different classes?

I am looking to book DEN-HDN (UA) Economy and HDN-ORD (AA) First, wondering if there is a cheaper/better way of booking than two single tickets...

So far all of the online booking engines I have found only allow "all economy" or "all first" bookings (one allows mixed itineraries, but only if the economy flight doesn't have a First cabin...)

Boo