Double Status Credit/Points March 2022 Offer - End date question

Is the end date of the current offer (and all others I guess) counted from the date you board the plane for your return flight, or on the date your return flight lands?

There is a conference I would like to attend in the US next year that ends on March 19th. I could, in theory, bolt straight to the Arizona airport, fly to DFW, or LA and make it back across the international dateline to land on March 21st - the end date of the offer.

But obviously it would be much better if I could avoid the scramble and depart for Oz on March 21st if it complies with the offer.

Just trying to avoid a long wait on the QFF call centre phone, so any info would be appreciated.

All dates for these promotions refer to the boarding date of the flight.

Excellent! Thank you John.