Flight FR7312 from Dublin to Zadar in Croatia lost cabin pressure and was diverted to Frankfurt Hahn airport.
Harry and his American wife Meghan are on a two-day visit to Dublin.
Qatar Airways’ direct service to Dublin, which was launched in June 2017, is set to further boost tourism and business links between Qatar and Ireland, an Irish Minister told Gulf Times.
Musician and Live Aid supremo Bob Geldof on Monday returned his Freedom of the City of Dublin scroll in a protest against Myanmar leader Aung San Suu Kyi, who holds the same honour.
Qatar Airways is to press on with plans to build a stake of up to 4.75% in American Airlines in the near future, despite the "categorical" opposition of the US company's management, Qatar Airways Chief Executive Akbar al-Baker said.
Hundreds of thousands of people lined the streets of Dublin to mark the 100th anniversary of the Easter Rising, a rebellion against British rule that paved the way for independence.