The UAE stopped issuing visas to Nigerians last year after Dubai's Emirates suspended flights due to an inability to repatriate funds from Nigeria.
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It is likely that the choice of route is made based on financial reasons. From looking at recent flights, Emirates seems to have a preference for flying over Iraq, but occasionally flies over Iran. The ATS overflight fees of Iraq are at $3751 (approx. $0.38 per km) considerably cheaper than those of Iran.
It's official: France bans short-haul domestic flights in favour of train travel. The idea for the ban originally came from a Citizens' Assembly. France's ban on short-haul domestic flights comes into force today (23 May).