It's not entirely clear to me, but I believe you are wanting the user to be able to interactively stop the search via ctrl-C
and then be prompted for input. This should do that:
#!/bin/sh
trap 'test "$airo" && kill -2 $airo' 2
airodump ... &
airo=$!
wait
unset airo
# Commands here will execute after the user hits ctrl-C to terminate the search