en_tn_lite_do_not_use/1th/04/17.md

we who are alive

Here "we" refers to all believers who have not died. (See: rc://en/ta/man/translate/figs-exclusive)

with them

The word "them" refers to the dead believers who were made alive again.

be caught up in the clouds to meet the Lord in the air

"meet the Lord Jesus in the sky"