Rick Kelsey

Hugo Brennan is from risk intelligence company Verisk Maplecroft, who put together the latest conflict intensity report, which maps global conflict.

The report shows that areas affected by armed fighting have grown by 89% over the past five years.

Each additional minute of flight time leads to an average increase in passenger fares.

of US$1.50, according to aviation experts at the German Aerospace Center.

The BBC has now heard from Lufthansa, one of the world's biggest flight operators, who say their long-haul journeys are growing by up to two hours, and it must now continually adjust its network planning to keep its schedule stable.

But it's not only cost, it's also emissions.

Dr. Victoria Ivanikova is Assistant Professor in Aviation Management at Dublin City University.

That's almost 11 million square miles.

Most Western airlines are now banned from flying over Russia, which pushes up the costs.

Gilbert Ott runs God Save the Points, who help people get low-price airfares.

Figures suggest that until recently, airfares have changed little when taking into account inflation over 10 years.

So you can still get deals, but the destination might be further away.

I'm the BBC's Rick Kelsey for Marketplace.