Flying cross stitch
Making sure that the top stitch is worked from bottom left to top right, make one cross stitch,
and then bring your needle up one canvas thread below the top right-hand corner of this stitch. Start your second cross from here.
This and every following cross should start one canvas thread below the previous cross.
Structure of stitch
Various Authors, The Royal School of Needlework Book of Embroidery (2018) , p.109