Best Way To Book
To get the cash fare down to $1,942, you'll need to book via AARP to get $200 off and then add the promo code BACHASE10 to get an additional 10% off. You'll need to log into your British Airways account before you add the promo code.
On Google Flights, look for flights priced at ~$2,360. Once you factor in the two discounts, that will get the price down to ~$1,942.
If you don't have an AARP account, it's only $12 but you can go through the shopping portal Top Cashback (my referral) and get $10.10 back.