European officials hope to return air traffic to at least half of its normal level today.  Millions of passengers have been stranded for days because of an enormous ash cloud from a volcano in Iceland.

Travel could start getting back to normal if that cloud begins to disperse.  Test flights are finding planes can apparently fly safely through it, but still, much of the airspace in europe is closed again today.
    
Even as this slowly begins to get better it's still a dicey situation.

Since last week, the shutdowns have stranded millions of travelers and are costing the aviation industry at least $200,000,000 a day.

It could take weeks to get all those stranded passengers on flights.