Other people were less sympathetic and remarked that the woman should have read the signs warning people to stay away from the area.
"Omg well well that when they don't listen and read and move away," wrote one person.
Several people were apparently holding on to the airport fence to ride the jet blasts of planes landing and taking off at Princess Juliana International Airport - a popular but dangerous tourist pastime.
The dead woman was with her family at the end of the runway when a Boeing 737 departed for Trinidad.
The jet's blast blew her and others backwards, causing her to fall and hit her head on the concrete pavement.
Signs at the airport warn of the dangers of standing too close to the fence.
A police report said the accident happened about 6pm on Wednesday, local time, at Beacon Hill Rd on Maho Beach.
Paramedics reportedly rushed to her aid but she died shortly after.
Aviation commentator Peter Clark said jet blast was "incredibly dangerous", particularly if someone was standing behind a large aircraft.
That particular runway was "very restrictive".
Clark said it was 2300m long - an "average" length runway - and planes would fly directly over the heads of beachgoers.
There's less than 50m from the end of the runway to the water. It's a normal runway but it's a very tight runway. The planes come right over that beach, virtually, to touch down."
He said thrillseekers liked to stand by the end of the runway so the jet blast could throw them into the water.
"People know the dangers. It would pick you up like a piece of paper."
Clark said there was more danger standing behind the blast from a taking-off plane than a landing one.