Usually, some flights departing/arriving ACE must do a fuel stop (ACE-Germany, ACE-UK...) as they are operated by B737, A320 and the plane cannot depart fully of fuel/passengers. Note the runway in ACE is not too long, and maybe during the flight the airstreams are blowing against it.
This fuel stops are not pre-scheduled and are usually decided when the plane departs from ACE (advise to passengers once they are onboard). Then passengers stay onboard during fuelling and after the plane continue to its destination.