EXPECTED_PRODUCTS_FIELD EXPECTED_PRODUCTS_SORT is a bad thing, it means that somewhere you're installation is not picking up constants from the database that should be defined as numbers or strings so it's throwing a sql error in the database because zencart should have passed it something like
order by product_name instead of that junk that you got outputted. In your case what has happened is your upcoming products box has crashed in this scenario.

This may however be nothing to do with the problem. Remove bog standard airmail and the please download this file

http://bouncing.org/rmamsmallpacket.php.zip

unzip it and place it over the top of the file in includes/modules/shipping/ then re-install airmail and see if it works on it's own. I think it would be best to start talking on my personal email too as this is getting quite in depth the address is nod at bouncing.org

Thank you

Philip.