You may want to invest in the OAG North America Executive Flight Guide.
It is published monthly (paperback) and you can also link with you PDA, Laptop, Desktop, etc to check all flight options on-line.
The cost is $119.00 / year. In this era of flying without airline published schedules (some airlines have discontinued publishing flight schedules) it is a good investment and lets you quickly determine your options.
If you get 1-2 days of work saved per year because the oag guide helped you get where you needed to go it would be a good investment.
Good Luck!
RC