Im considering taking a trip next year (with a mix of Alaska and Fiji Air flights) to Australia with a stopover in Fiji. The award chart says it costs 55k in Alaska miles. The routing would be IND/BNA to LAX/SFO to NAN to MEL. Alaska's search engine keeps showing mixed class itineraries with economy class flights on the Alaska IND/BNA to LAX/SFO and business class flights to NAN and MEL. It does not offer First class Alaska flights for this itinerary at any cost, even though first class rewards flights are available individually on the dates I checked. I have looked at different days in several months but the search engine only offers economy on the Alaska flights. It appears there is no business class on the Alaska flights and the first class cost IND/BNA to LAX/SFO is 60k. I assume the problem is that those flights require more miles than the international flights, but it seems really odd to me that there is no way to book the premium cabin for the entire trip.

Has anyone else had this problem? Is there any way around this?

Thanks