Ya he is:
Matthew 11:13 ""For all the prophets and the law prophesied until John. And if ye will receive it, this is Elias, which was for to come."
Matthew 17:12 " But I say unto you, That Elias is come already.... then the disciples understood that he spake unto them of John the Baptist."
Mark 9:13 " But I say unto you, That Elias is indeed come, and they have done unto him whatsoever they listed, as it is written of him"
No he isn't:
John 1:21 " And they asked him, What then? Art thou Elias [Elijah]? And he saith, I am not"