My guess is the other passengers weren't aware of WHY the flight was delayed for this family, and just assumed they were running late and so the flight was held up to wait for them. At least I sincerely hope that is the reason.
From the Army Times:
"The American Airlines flight from Sacramento was delayed, leaving about 45 minutes behind schedule, according to Stewart Perry, and time was running out for the family to make their connecting flight in Phoenix.
When the plane arrived in Arizona, the captain announced that everyone was to remain seated to allow the Perry family to leave first.
“When he made that announcement, there was some hissing and some booing behind us,” said Perry, who was sitting in first class.
Perry, a Marine veteran, doesn’t remember the captain telling everyone the reason they had to wait, but he said he does recall the captain mentioning “military personnel.”
“I believe that the passengers knew there was a Gold Star family on board,” he said. “The woman sitting directly behind us touched me on the shoulder and asked if I was the father of the soldier killed in Afghanistan.”
That leads Perry to believe some kind of announcement was made before he and his family sat down.
“It was very disappointing,” he said. “It’s just enough to put you over the edge.”
https://www.armytimes.com/articles/...mpassion-after-airplane-passengers-boo-family
and from Stockton:
"Stewart Perry said he, his wife, Kathy, and daughter were flying on an American Airlines flight from Sacramento on Monday to Philadelphia, with a quick transfer in Phoenix. From Philadelphia, they traveled to Dover Air Force Base in Delaware to receive his son’s remains.
For unknown reasons, Perry said, the flight to Phoenix was 45 minutes late. The crew feared the delay might cause the Perrys miss their connecting flight.
So, when the plane landed in Phoenix, the captain made an announcement for all passengers to remain seated and to let a “special military family” exit the aircraft first, Perry said.
Several passengers in first class began to boo and complain, Perry said.
“Some people were saying ‘This is just baloney,’ and ‘I paid for first-class for this?’ ”
He said American Airlines “did everything they could” to accommodate his family.
Perry and his family made their connecting flight, and the pilot in Phoenix stayed at the gate for 40 minutes to make sure they made it on board.
“It was just disgusting behavior from people in first class. It was terrible to see. Perry said. “You could see the disappointment from the flight crew.”