

If the tax is on fuel then it wouldnt matter where they are registered, they’d be getting refueled in the EU and so would pay the tax.
wouldn’t this result in airlines dumping the extra cost on customers
yes, partially. If the increase in tax results in a particular flight being £50 more expensive for example they will rise prices by an amount. But it likely wont be the full 50 as airlines are already charging what they think the optimum price is, the price going up is likely to result in less sales.
It also incentivises the airlines to be more fuel efficient (and so less damaging to the climate), and punishes worse offenders like private jets more as the use more fuel per passenger mile.
I dont think AI has much to do with them dropping the greenwashing, it’s kissing the ring to Trump. If Harris had won they would still be going just as hard on AI but trying harder to keep the green messaging going.