Swap a wing 1
Step 1 / 8
x': Whole cube: turn 90°, front face goes down
Left edge: the back wing matches, the front wing belongs to the right edge. Right edge: the back wing belongs to the left edge, the front wing is flipped.
The last two edges on the left and right of the top. The x' at the start brings them to the front.
Step 1 of 8: x'. Whole cube: turn 90°, front face goes down