I guess that is the most probable reason why they did it. We departed from San Diego and it was extremely hot. I am travelling on a trip next week. I will try to see if the pilots do that again, or if it is just a one time thing for hot environments.
Hello, I was on a Southwest 737-700 the other day and I noticed that after the pilots started engine 2 they turned the right pack on and then both packs on after both engines started. I normally only turn both packs on until both engines are started. I tried this different style with the pmdg ngx and it worked. Could anyone explain why this is done and if this is done on a normal basis? Sam