This award availability is worth a look for families planning a spring trip to London. At 40,000 miles per person in Premium Economy, you're getting a solid value compared to the ~70,000 miles American typically charges for this cabin on transatlantic routes. The catch: expect $484 per person in taxes and fees, which is standard for flights landing in the UK.
Premium Economy on British Airways (the likely operating carrier) offers more legroom, wider seats, and better meal service than standard economy—a meaningful upgrade on an overnight crossing, especially if you're traveling with kids who need room to sleep.
Only 3 seats are currently available at this price, so this works best for smaller groups or couples. If you're booking for a family of four or more, you may need to get creative with split itineraries or look for other dates.
One practical tip: AAdvantage miles transfer instantly from hotel programs like Marriott Bonvoy if you're short on miles, though the transfer ratio (3:1) means this only makes sense if you're topping off a balance rather than starting from scratch.
How to book
Search and book directly through American Airlines at aa.com. Log into your AAdvantage account, select "Redeem miles," and enter Boston (BOS) to London (LHR) for April 8, 2026.