The Bible speaks of the last trumpet when the dead in Christ are raised to meet Him in the air; the last trumpet is the seventh trumpet which heralds the end of the Tribulation. How can the saints be caught up in the air at the last trumpet when it announces the end of the Tribulation?
When Paul penned his letter to the Thessalonians, the destruction of Jerusalem had not yet happened AND the Revelation of John had not been written. It is doubtful that Paul would have referred the Thessalonian believers to something that had not even been written yet. Look for another source as having a ‘last trumpet sound’ ...