Any advice or experiences from older threads (like that one) is shaky since AA is no longer a partner.
AA is still a partner through March 1 next year, OP is traveling before that date.
https://www.alaskaair.com/content/mi...er-overview:AA
For trips booked on or after October 2, 2019, travel must be completed by February 29, 2020 in order to earn miles
I would expect that BPs can be mailed in and manually credited up to the end of February.