Aviation Dictionary
جهت پرواز در جهت وزش باد به عبارتی جهت حرکت هواپیما به گونه ای باشد که باد پشت سر داشته باشد.
The direction measured relative to the way the wind is blowing. Downwind means the direction in which the wind is moving.
In the direction in which the wind blows; with the wind behind.