Tehraninfo-icon: An Iranian passenger plane hovered over Hamburg due to heavy fog for over one hour and then had to fly 1,000 kilometres south to refuel in Milan, as USinfo-icon sanctions prevent western supply companies to sell fuel to Iraninfo-icon Air.

On Monday, an Iran Air Airbus A330 operating Flight IR723 took off from Tehran's Imam Khomeini International Airport at 04:03 local time and headed for Hamburg, Germanyinfo-icon, where heavy fog prevented a safe landing, a news report said on Thursday.

The plane entered loiter mode waiting for the fog to clear, but a little over one hour later, it lifted back up to 30,000 feet and took off for Milan, rather than heading towards a different German airport, and eventually landed at Milan Malpensa, Simple Flying reported.

After nearly three hours on the ground at Milan Malpensa, the passenger plane finally made its way back north toward its intended destination.

As a result of sanctions the US began to reimpose on Iran in 2018 - after former US president Donald Trumpinfo-icon withdrew Washington from the Iran nuclear agreement - many western supply companies, wary of punitive measures, have stopped selling fuel to Iran Air in order to comply with the US bans on Iran and its flag carrier.

The sanctions make any third parties who supply Iranian airlines with maintenance, catering, refuelling, and even booking, also liable to prosecution, pressing fuel companies to choose between operating in the US and selling fuel to Iranian airlines.

Iranian passenger planes normally carry enough fuel with them to make their trip to Europe and return to Tehran. But due to the prolonged trip on Monday morning, the A330 no longer had sufficient fuel to make it back home.

Although the US government insists that the sanctions do not target civilians, the ban on sales of spare parts for aircraft and the prohibition of selling fuel to Iranian aircraft are only two examples - among many more - of how Washington endangers people's lives through its unilateral coercive measures, a Press TVinfo-icon report said.

The harsh sanctions also prohibit the purchase of new aircraft, so Iranian airlines normally operate older passenger planes.