For Your info Dana is all economy so seating configuration is 150+
Possible seating config for M83 is up to 165. The figure of 140 is from Dana Air's own website, I didn't suck it out of my thumb.
Found a report stating
Lagos Plane Crash: 153 Passengers Feared Killed | Sahara Reporters
The flight,9J-996, originating from Abuja, was approaching the Murtala Mohammed International Airport in Lagos, with less than four minutes to landing.
That flight is (apparently) scheduled to operate departing ABV at 1926 and arrival LOS 2043 so .... who knows.
From Dana Air's website :
Lagos (LOS) 9J996 19:26 20:43 01:17 NonStop Sun