I don’t know where the mistake is, but a Cessna 140 cannot hold four adults. Even two adults and two little kids are a stretch.
I used to own one. It is/was SMALL.
From the article:
Elizabeth Cory, a spokeswoman for the Federal Aviation Administration, said the Piper 32 was traveling from Hereford, Texas, to Gettysburg, South Dakota.
The Cessna 140 reference was to a similar accident, not this one.