Ukraine bans all Russian planes from using its airspace as Russian state-controlled energy giant Gazprom stops delivering gas to its neighbour.
Shares in Asia's biggest budget airline, AirAsia, fell as much as 7% on Friday after the firm posted a loss in the three months to September.
Rolls-Royce chief executive Warren East says he understands investors' concerns and promises to be more transparent about the risks it faces.
Dubai is getting bigger, brasher and louder
Are they really now a practical means of flying?
The UAE aims for the Red Planet
The printed plane takes shape at Dubai Airshow
Dubai Airshow becomes focus for defence industry
Growing congestion could limit Gulf airlines' plans
Fasten your seatbelts for a short flight across the history of Britain's love affair with air travel.