One day left to book the British Airways Double Avios on all flights worldwide offer

You have one more day to get all your British Airways flight bookings
made to earn Double Avios on them for the remainder of the year.
Remember when you register and book British Airways flights by April 19
you’ll earn 100% bonus Avios on those flights. The bonus is good for up
to 6 flight sectors. This means if you are flying point to point it
would be valid for three round trips. However if you are flying a route
like New York-London-Milan that would count as 4 sectors if flown round
trip.

Offer details:

Double Avios on all British Airways flights worldwide and also on a BA
prefix on American Airlines, Iberia or Finnair between Europe and North
America. The promotion also applies to travel on domestic flights within
the UK and southern Africa (operated by Comair), Sunnair and
CityFlyer.  Full details, online registration and booking (Registration is required) Register and book by Apr 19 for travel until Dec 31, 19

Find many more Executive Club bonus Avios offers here!