You can find plenty of documentaries that cover this incident on youtube too.
(Multiple witness's, credible pilot witness's and radar corroboration)4.
Also consider Stephen Hawkings point, if an alien lifeform were to find us they are unlikely to be friendly and we'd definitely know about it! If they feel the witness is not credible then their evidence is ignored.
How many of these 200 people also claim to have seen Santa Clause, the Tooth Fairy and the Easter Bunny? The problem with people who believe in extra-terrestrial activity is that they never discount eye-witness testimony.
(Multiple witness's, a very credible witness in the pilot , plus corroborating evidence from ground radar and other airliner's in the area) 2.