The headline says it all...
From the PA article with that headline:
"Europe's busiest airport reopened Tuesday as air traffic across the continent lurched back to life. But the gridlock created by Iceland's volcanic ash plume was far from over: Officials said it would be weeks before all stranded travelers could be brought home.
"Passengers wept with relief as flights took off from Paris' Charles de Gaulle Airport, Amsterdam and elsewhere. A jetliner from Vancouver, British Columbia, was the first to land at London's Heathrow airport, the continent's busiest, since the volcano erupted last week.
"British Airways said it expected about two dozen flights from the United States, Africa and Asia to land by early Wednesday."