If you specifically want PE then you might want to consider Virgin Atlantic or British Airways on SFO to LHR and then a connection to AMS which given it’s less than an hours flight is well survivable in economy.

Virgin also have economy delight which whilst still economy does have extra leg room seats included in the price.

it may even be cheaper that the non stop flight to AMS.

If Air France has PE then consider them to CDG then a short economy hop to AMS.

Or Aer Lingus SFO-DUB-AMS



There is more than one way to skin a cat to get a better seat but for not much added time.

As an example and although this is in business I’m doing SFO-JFK-LHR later in the year to get a better seat than the non stop BA flight for what I consider to be a reasonable added time element and a considerable saving over the VS direct flight.