The aftermath of the engine explosion that tragically killed a woman on a Southwest Airlines flight this week revealed another worrying safety concern for flyers.
Pictures taken aboard Flight 1380 as it made an emergency landing in Philadelphia showed that many passengers weren't correctly wearing their oxygen masks.
The masks drop down from above passenger seats when the plane's cabin suffers a loss of pressurization, as what happened earlier this week when the engine explosion smashed a window in the plane.
Because the air is thinner at altitude, the masks provide a steady supply of oxygen for several minutes until the pilots have successfully descended to a height where the air is easier to breathe.
The picture above shows that passengers made a huge mistake, in that they only put the mask over their mouths, when it should be over the mouth AND the nose.
Some of those in the picture also failed to secure the mask around their heads using the elastic strap.
Their example should hopefully make people think twice before ignoring the pre-flight safety checks before takeoff (put down those phones, people).
To refresh your memory, here's Delta's video that shows how to correctly put on the mask, and how to help a child put theirs on (correct part starts at 2:10).