>>>>>Same fare class?
No, you are right--class bucket availability will affect the price of some flights. Last year I even saw all buckets below B pulled on one of my advance schedules and then added back later!
>>>>any roundtrip tickets originating in Europe?
The HAM-PAR $75 ticket--which was the only ticket not purchased at nwa.com (it was purchased at Travelocity, and ALL other outlets, including Opodo and the European Travelocity site, were significantly higher--I'm seeing some great intra-European fares at travelocity.com not available anywhere else). The August ticket that went from 180 to 309 is a Hamburg-Venice purchased at nwa.com.
>>>>did any of your 2005 trips use any coupons for discount air travel or if they were included in a hotel/cruise package?
Nope!
>>>>>have you resorted to nesting itineraries within itineraries yet?
Good point. Is nesting illegal from NWA's standpoint though?