From Wiktionary, the free dictionary
From x- + wind.
xwind (plural xwinds)
- Abbreviation of crosswind.
1998 October 29, Mike Regish, “Taxiing in xwind”, in rec.aviation.student[1] (Usenet), retrieved 2022-05-19:I was back taxiing to takeoff position in a xwind yesterday. The xwind was coming from the right when I was in position to take off.
2003 September 17, Maule Driver, “Cherokees and X-winds”, in rec.aviation.student[2] (Usenet), retrieved 2022-05-19:I believe that all xwind landings should end in a wing low slip with the longitudinal axis aligned with the direction of movement.
2006 February 4, A Lieberman, “Xwind landing experiences today & questions”, in rec.aviation.student[3] (Usenet), retrieved 2022-05-19:I bit the bullet today and went out to the airport to work on my Xwind landings.