For the Scheduling and Manage Routes, show an empty page by default until data is fetched using the search box on the left.
The default view is really useless once you get past 1 page worth of aircraft/routes (whatever your setting is) as you typically know what you're going to the page for. Also, it will bring to attention the usefulness of the search feature for new players (I've been playing for years and didn't immediately realize the usefulness when the site was redesigned with it). The default message could simply say use the search box on the left and/or click an inline link to view the "default" view of all aircraft.
The big reason being when I go to the scheduling page with 70 aircraft and then use the filters to get the aircraft I want, the search results will load with the small handful of aircraft I was looking for. Then, since I have the default view set to 70 and it takes longer to generate on the server, my search results of a small handful of aircraft will be replaced by the default view and then I'll have to run the search again, which is frustrating. 98% of the time I have zero interest in the default pages generated on the Manage Routes and Scheduling pages and it just slows things down and/or adds extra steps to get to what I'm looking for.
I think most power users would agree with me...