Ameican Express Membership Rewards is offering a 35% bonus on transfers to British Airways Avios through June 7.
Avios are most useful for short-haul non-stop flights (longer flights cost more points). And where there’s a fuel surcharge on a paid ticket British Airways adds that to the fees on a paid ticket.
For transatlantic travel there’s savings in flying Air Berlin (no fuel surcharges) or Aer Lingus (very low charges) rather than flying British Airways or American. There are no fuel surcharges on domestic US travel or flights to and from South America on American or LAN.
(HT: Rob on Milepoint)