Is this for real or just a paper exercise?
Titan Airways at Stansted have a B767-300 that seats 265 pax. *Fuel costs would be dependent on routing and weather conditions on the day avoiding the worst Jet -Stream Headwinds when Westbound and maintaining legal ETOPS *limits.*
This would be predicted by Jetplan Computers and finally decided on by the Captain on the day with regard to destination and alternate diversion airports weather forecasts etc.*
If for real you can find Titan's website via Google.
( I have no connection whatsoever with Titan but have worked with them in the past)