Trying to plan one now, using the online tool to price so that I can try changing cities and flights to see the effect on the "taxes." If I end in TLV, the tool won't price it ("We are unable to offer you our lowest fare...."). If I end in KRT, it prices at $7,736 base plus $2,212 in "taxes"! Why the $7,736 base?

Routing KRT-AMN-LHR-LAX-JFK-HKG-TPE-HKG-SYD-AKL-SYD-LHR-AMN-KRT, the "taxes" include:

• Jordan Civil Aviation Fee - Transfer Passengers 12.86 USD
• Tax description unavailable (YRVB) 500.00 USD
• Multiple Surcharges 63.00 USD
• Airline Fuel Surcharge 395.20 USD
• Tax description unavailable (SDEM) 823.60 USD
• Tax description unavailable (NYSE) 6.63 USD
• UK Passenger Service Charge 95.50 USD
• U.S. Customs Fee 5.50 USD
• International Arrival Transportation Tax (USA) 16.70 USD
• U.S. Animal and Plant Inspection Service Users Fee 5.00 USD
• Immigration and Naturalization Service Fee 7.00 USD
• September 11th Security Fee 10.00 USD
• Taiwan Airport Service Charge 10.26 USD
• Australian Passenger Service Charge 107.00 USD
• Australia Passenger Movement Charge 113.54 USD
• Passenger Security Charge at Auckland Airport (Arrivals) 14.47 USD
• Passenger Security Charge at Auckland Airport (Departure) 14.47 USD
• Passenger Security Charge for New Zealand 7.38 USD
• Passenger Facility Charges 4.50 USD
• 2,212.61 USD

The ones in red seem especially high and I'd like to see if they can be reduced. There's no stop-off in LHR, just connections, so I'm surprised at the UK $95.