C&P by me:
Pretty much none of those planes on the flight tracker, are looking for this plane, though. They are busy doing their job, which is to get to their destination.
Also, the ocean is a huge, huge place. I mean, it took five days to find Air France and that was WITH the transponder working. end c&p
While pilots are flying plane there are thousand of eyes looking down. Granted a lot higher than search planes, but it only takes one sharp eye.
However the plane was tracked a lot further than was first reported. Also believe USA stated they picked up no evidence of explosion.
It may have taken days for searcher to find actual spot of AirFrance, but debris started to surface within 48 hours, bodies were found day 5 or so.
Air France Flight 447 - Wikipedia, the free encyclopedia