Sure you aren't confusing airline surcharges with proper government taxes?
On a BA booking of the £ 1,300 fare I quoted above UK APD is £180 (out of a total £ 267.62 of proper UK and US government taxes and airport fees)
The BA base fare is £ 632 and their surcharge is £ 400 (but they add the £400 to the £267.62 under all one heading of 'taxes, fees and surcharges)
Jet Blue is charging exactly the same £ 267.62 for proper government taxes and airport fees . They do appear to be charging only £300 as their surcharge,
Surcharge is 100% down to the airline.