www.simbrief.com/home/--Use this website to find how much fuel and the optimum cruising altitude for your flight. I personally recommend 1,000 pounds extra and a 60 minute reserve of fuel.
http://flightaware.com/statistics/ifr-route/ --Use this website if you want to know if any of our airlines fly between two airports. If you find a route, please put that route in #business in slack and we will add it to the database.