Experts say it is just "a matter of time" before another volcano in Iceland erupts with the potential to cause major disruption to flights like in 2010. Then most services in Europe were grounded for a total of eight days causing misery to millions of people.
The problem is that when a volcano explodes it can send millions of ash particles into the air causing a cloud. If a plane flies into it engines can be badly affected and even stop.
So now Easyjet and Airbus are developing a system called AVOID that would better detect ash in the sky. Planes would be fitted with sensors that detect it and they would be directed around the ash by air controllers.
Airlines say it is a much better alternative to the current system which is to ground flights over a wide area. The sensors feed back information from the system which is added to data from satellites.
The aim is to keep more planes flying and reduce the type of disruption in 2010.