Nice icon. I like that. =)
Let's go to the source shall we?
JESUS’ FLESHLY BODY DISSOLVED
What happened to the perfect fleshly body of Jesus after his death? Was it preserved so that in time men will look upon it in worship? or does Jesus still have this fleshly body in the heavens, “spiritualized” so that it can be seen and worshiped? Neither. The Scriptures answer: It was disposed of by Jehovah God, dissolved into its constituent elements or atoms...
Moses’ body returned to the dust by process of decay, as all human bodies do, but not so in Jesus’ case, for it is written: “For thou wilt not leave my soul to Sheol; neither wilt thou suffer thy holy one to see corruption.” (Ps. 16:10, AS; Acts 2:31) So God caused Jesus’ body to disappear, but not corrupt, meaning that it was dissolved, disintegrated back into the elements from which all human bodies are made.—John 20:1-13.
JESUS RESURRECTED WITH SPIRIT ORGANISM
The resurrected Jesus was given a spirit body: “He being put to death in the flesh, but being made alive in the spirit.” (1 Pet. 3:18, NW) “Whom not one of men has seen or can see.” (1 Tim. 6:16, NW) Paul merely caught a glimpse of the glory of Jesus’ spirit body and was blinded. (1 Cor. 15:8; Acts 9:17, 18) At the resurrection of his faithful followers in whom God has cultivated heavenly hopes they will be given, not fleshly, but glorious spirit bodies. We all know what a fleshly body is like. But John says: “Beloved ones, now we are children of God, but as yet it has not been made manifest what we shall be. We do know that whenever he is made manifest we shall be like him, because we shall see him just as he is.”—1 John 3:2, NW.
When Jesus was on earth he was said to be “lower than the angels”. Man is lower than angels. Certainly one who is in the flesh is lower than one who is in the spirit. God often contrasts flesh and spirit. (Ps. 8:4, 5; Heb. 2:9; Isa. 31:3) Could you believe that Jesus Christ, the majestic King of the new world, made higher than all other creation, would remain in a body of flesh? He would be inferior to a spirit and far too limited to accomplish the marvelous things required of such King, among them the destroying of the mighty spirit person Satan the Devil.
A human body requires earthly elements for its continued existence. It is made for the earth and must subsist upon the things produced from the earth. (1 Cor. 15:40, 47; Isa. 45:12, 18) God does not violate his own laws that he has established to govern natural things. Therefore he would not take a human body out of its proper habitation and transfer it to the heavens, the realm of spirit persons.
HIS POST-RESURRECTION APPEARANCES
What about the bodies in which Jesus appeared after his resurrection? He manifested himself on one occasion in a body that had wounds into which Thomas was able to place his hands to prove that Jesus was the same person, resurrected, whom Thomas had known as the Master. But if Jesus took his human body to heaven to keep these wounds forever, this would be contrary to God’s laws governing fleshly bodies and their ability to repair themselves. Moreover, if Jesus sacrificed his human body for the life of the world and then took it back, retaining it for himself, he could not offer such merit before God in behalf of others. The ransom would be taken back, leaving mankind still in their sins.
So these bodies that Jesus appeared in after his resurrection were materialized bodies. Similar instances occurred in ancient times, such as when the three men visited and ate with Abraham, and those appearing to Lot, in each case being angels who materialized in the form of men. Jesus’ materialized bodies were signs, evidences to eyewitnesses proving he had been resurrected according to the promise of Jehovah God.—Gen. 18:1-22; 19:1-16; John 20:29-31.
The proofs that these were bodies materialized for the occasion are many. Mary, when she first saw Jesus after his resurrection, did not recognize him, thinking that he must be the gardener. On the road to Emmaus, he was recognized by his manners and actions, not by his facial features. (John 20:14-16; Luke 24:13-32; Mark 16:12) When he materialized a body with wound marks to convince the doubtful Thomas, Jesus appeared in a room with locked doors. (John 20:26-28) This shows that he could materialize and dematerialize a body instantaneously. Scientists claim the ability to make material substance out of pure energy. How easy for the power of the resurrected Jesus, then, to materialize a body!...
(So in summary, Jesus' fleshly body was not permitted to decompose by natural means,...it was dissolved or disintegrated in whatever manner God chose to do so in order that it would not decay and see "corruption" the way other dead bodies do as the flesh breaks down and rots...Jesus then appeared to his apostles & disciples in *materialized* bodies, during that 40-day period prior to his *final acsension* to Heaven).
excerpt taken from:
(pgs 518-519 of the 9/1/53 Watchtower)
FYI - I intentionally chose an older article to show that the explanation to this question was just as clear and understandable decades ago in the Watchtower magazine, as it is today in recent publications.