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I like the rolled up level where you tell the user "You have a package and it costs this much." For the components of the package (flight, hotel, etc.) you may want to give the user a little more detail or display the details rather than have them be collapsed. The details for those items (so things like airplane types, etc.) could be expand/collapsed and displayed as collapsed (most people won't care at that point to see them). However, maybe give the information in a shorter, abbreviated form to the user earlier on rather than hide it.
I'm also wondering where in the flow this will appear. If it is on a review screen - I'd say show the abbreviated information most definitely. If it's in path, hide it with the user having the opportunity to view or close it.
I hope this helps......

Great feedback Mary, thank you; great point about where in the flow this appears as well - We envision this throughout the user's navigation through product options and creating their itinerary, but also on a review page - I'm thinking that the review page would show the full details by default.
I like your input on fewer expand / contracts - this is one of the things I was concerned about as well.