Formerly WestJet airlines registration C-GWJK and entered into service with Southwest just two days prior to this photo on 17 SEP 2016.
Southwest 3278 to BWI .
Southwest 1645 to MCO . Ex-China Eastern.
Climbing out from runway 11.
Slowing down showing the reverse thrust engaged runway 11.
Flight 2923 to LGA. This one is an ex-Aeromexico, XA-QAM