Someone please explain me this. when I am booking an award ticket

Wed 18 Jul 16:30 Telaviv Yafo 19:45 Frankfurt LH687 7h40 Economy
Wed 18 Jul 21:35 Frankfurt 22:10 London, Heathrow LH4744 Economy
Thu 16 Aug 06:15 London, Heathrow 08:55 Zurich LX345 6h15 Economy
Thu 16 Aug 09:45 Zurich 14:30 Telaviv Yafo LX254 Economy


Taxes are

Fuel and Security Surcharge (YQ) USD 60.00
Airport Passenger Security & Noise Charge (CH) USD 19.00
Air Passenger Duty (APD) (GB) USD 80.68
Airport Security Charge (DE) USD 9.25
Departure Passenger Airport Tax (IL) USD 13.00
Passenger Service Charge (UB) USD 28.84
Passenger Service Charge - Intl (RA) USD 16.09
Other Tax/Charge (YR) USD 80.00
Total USD 306.86



When I book the exact same flight in business class taxes are


Fuel and Security Surcharge (YQ) USD 60.00
Airport Passenger Security & Noise Charge (CH) USD 19.00
Air Passenger Duty (APD) (GB) USD 161.36
Airport Security Charge (DE) USD 9.25
Departure Passenger Airport Tax (IL) USD 13.00
Passenger Service Charge (UB) USD 28.84
Passenger Service Charge - Intl (RA) USD 16.09
Other Tax/Charge (YR) USD 80.00
Total USD 387.54



Can someone explain me what Air Passenger Duty is and why exactly it doubles up in business class???