Departing from the USA to Thailand. All of the online travel engines I've seen, e.g. Expedia and Orbitz, will allow a round-trip itinerary with only ONE class of service. I'd like to find an online site to book one segment (DFW > LAX on AA) in Economy, then one segment (LAX > BKK on EVA) in Deluxe Economy, all on one ticket. Thank you!