"If there is only one archangel, why does the word "an" appear before the word "archangel" in this verse implying that there is more than one?"
The Greek word used at 1 Thess. 4:16 in the New Testament text is in the Genitive case. This means that even if there is no article ('the') with it, it can still be understood to be definite ('the archangel'). That is why The NRSV has "with the archangel's call" and The Revised English Bible has "the archangel's voice is heard" and the New Jerusalem Bible has "At the signal given by the voice of the Archangel". (Also compare the ASV, BBE, CBE, GNT, HNV, CSB, KJV, LEB, NAS, NCV, NIRV, NIV, NLT, RSV, TMB, TNIV, TYN, WEB and GOD'S WORD Translation Bibles.)
The Greek word used at 1 Thess. 4:16 in the New Testament text is in the Genitive case. This means that even if there is no article ('the') with it, it can still be understood to be definite ('the archangel'). That is why The NRSV has "with the archangel's call" and The Revised English Bible has "the archangel's voice is heard" and the New Jerusalem Bible has "At the signal given by the voice of the Archangel". (Also compare the ASV, BBE, CBE, GNT, HNV, CSB, KJV, LEB, NAS, NCV, NIRV, NIV, NLT, RSV, TMB, TNIV, TYN, WEB and GOD'S WORD Translation Bibles.)
Questions about the Archangel:
What is an Angel? ( Insight-1 pp. 106-108; Watchtower Online Library)
What is the Archangel and is there more than one? ( Insight-1 p. 156; Watchtower Online Library)
ARCHANGEL - Links to Information (INDEX; Watchtower Online Library)
MICHAEL (Archangel) - Links to Information (INDEX; Watchtower Online Library)
Archangel (Search Results From the Watchtower Online Library)
Quotes From Scholars Concerning Jesus as Michael the Archangel (Defend Jehovah's Witnesses)
Why Do Jehovah's Witnesses Conclude That 'Michael' is a Name For Christ in Heaven? (Defend Jehovah's Witnesses)
Why Do Jehovah's Witnesses Believe That Jesus is Michael the Archangel? (Defend Jehovah's Witnesses)
Jehovah's Witnesses - Not the Only Ones Who Reason That Jesus is Michael the Archangel (Defend Jehovah's Witnesses)
Does the Definition of "Archangel" Help Indicate Whether There is More Than One? (Defend Jehovah's Witnesses)
Where Does it Show in the Bible That Jesus is Michael the Archangel? (Defend Jehovah's Witnesses)
Does Daniel 10:13 Prove That Michael the Archangel is Not Jesus Christ? (Defend Jehovah's Witnesses)
In Jude 9, why couldn't Michael the Archangel make a judgement against the Devil? (Defend Jehovah's Witnesses)
Son of Man Reaps Like An Angel - Rev. 14:14-20 (Defend Jehovah's Witnesses)
If there is only one archangel, why does the word "an" appear before the word "archangel" at 1 Thess. 4:16 implying that there is more than one? (Jehovah's Witnesses Questions and Answers)
"It has never been that we see Jesus as "only" the archangel." (Modern example also included) (Jehovah's Witnesses Questions and Answers)
Is Jesus an Angel? Scriptures and Quotes to Consider:
Does Hebrews Chapter 1 show that Jesus is (and was) an angel and distinct from God? (Search For Bible Truths)
"An angel of God, as Christ Jesus Himself." (Gal. 4:14) (Search For Bible Truths)
Jesus - "The Bright Morning Star" (Search For Bible Truths)
What single angel would be capable of defeating Satan and casting him into the pit? (Rev. 20:1-3) (Search For Bible Truths)
Scholars' Quotes Concerning Jesus as an Angel (Search For Bible Truths)
Did Satan have more power than Michael according to the account at Jude 9? (Search For Bible Truths)
Pages That Examine Scriptures Concerning the Archangel:
The Bible’s Viewpoint - Who Is Michael the Archangel? (g02 2/8 pp. 16-17; Watchtower Online Library )
Who Is Michael the Archangel? (bh p. 218 - p. 219 par. 1; Watchtower Online Library )
Is Jesus the Archangel Michael? (w10 4/1 p. 19; Watchtower Online Library)
MICHAEL (Insight-2 pp. 393-394; Watchtower Online Library)
Is Jesus Christ the same person as Michael the archangel? (Insight-2 pp. 393-394; Watchtower Online Library)
Jehovah's Witnesses - Not the Only Ones Who Reason That Jesus is Michael the Archangel (Defend Jehovah's Witnesses)
Is Jesus Christ Michael the Archangel? (Pastor Russell)
Who is the Archangel Michael? (Bible Translation and Study)
Biblical and Historical Views of Christ as an Angel (Jehovah's Witnesses United)
Angels as Jehovah's Representatives - Is Jesus Christ Michael the Archangel?
(Jehovah's Witnesses United)
High Angel Christology: Is Jesus Christ Michael the Archangel? (Jehovah's Witnesses Redefended)
What is an Angel? ( Insight-1 pp. 106-108; Watchtower Online Library)
What is the Archangel and is there more than one? ( Insight-1 p. 156; Watchtower Online Library)
ARCHANGEL - Links to Information (INDEX; Watchtower Online Library)
MICHAEL (Archangel) - Links to Information (INDEX; Watchtower Online Library)
Archangel (Search Results From the Watchtower Online Library)
Quotes From Scholars Concerning Jesus as Michael the Archangel (Defend Jehovah's Witnesses)
Why Do Jehovah's Witnesses Conclude That 'Michael' is a Name For Christ in Heaven? (Defend Jehovah's Witnesses)
Why Do Jehovah's Witnesses Believe That Jesus is Michael the Archangel? (Defend Jehovah's Witnesses)
Jehovah's Witnesses - Not the Only Ones Who Reason That Jesus is Michael the Archangel (Defend Jehovah's Witnesses)
Does the Definition of "Archangel" Help Indicate Whether There is More Than One? (Defend Jehovah's Witnesses)
Where Does it Show in the Bible That Jesus is Michael the Archangel? (Defend Jehovah's Witnesses)
Does Daniel 10:13 Prove That Michael the Archangel is Not Jesus Christ? (Defend Jehovah's Witnesses)
In Jude 9, why couldn't Michael the Archangel make a judgement against the Devil? (Defend Jehovah's Witnesses)
Son of Man Reaps Like An Angel - Rev. 14:14-20 (Defend Jehovah's Witnesses)
If there is only one archangel, why does the word "an" appear before the word "archangel" at 1 Thess. 4:16 implying that there is more than one? (Jehovah's Witnesses Questions and Answers)
"It has never been that we see Jesus as "only" the archangel." (Modern example also included) (Jehovah's Witnesses Questions and Answers)
Is Jesus an Angel? Scriptures and Quotes to Consider:
Does Hebrews Chapter 1 show that Jesus is (and was) an angel and distinct from God? (Search For Bible Truths)
"An angel of God, as Christ Jesus Himself." (Gal. 4:14) (Search For Bible Truths)
Jesus - "The Bright Morning Star" (Search For Bible Truths)
What single angel would be capable of defeating Satan and casting him into the pit? (Rev. 20:1-3) (Search For Bible Truths)
Scholars' Quotes Concerning Jesus as an Angel (Search For Bible Truths)
Did Satan have more power than Michael according to the account at Jude 9? (Search For Bible Truths)
Pages That Examine Scriptures Concerning the Archangel:
The Bible’s Viewpoint - Who Is Michael the Archangel? (g02 2/8 pp. 16-17; Watchtower Online Library )
Who Is Michael the Archangel? (bh p. 218 - p. 219 par. 1; Watchtower Online Library )
Is Jesus the Archangel Michael? (w10 4/1 p. 19; Watchtower Online Library)
MICHAEL (Insight-2 pp. 393-394; Watchtower Online Library)
Is Jesus Christ the same person as Michael the archangel? (Insight-2 pp. 393-394; Watchtower Online Library)
Jehovah's Witnesses - Not the Only Ones Who Reason That Jesus is Michael the Archangel (Defend Jehovah's Witnesses)
Is Jesus Christ Michael the Archangel? (Pastor Russell)
Who is the Archangel Michael? (Bible Translation and Study)
Biblical and Historical Views of Christ as an Angel (Jehovah's Witnesses United)
Angels as Jehovah's Representatives - Is Jesus Christ Michael the Archangel?
(Jehovah's Witnesses United)
High Angel Christology: Is Jesus Christ Michael the Archangel? (Jehovah's Witnesses Redefended)