So, I decided to do
a bit of research. You know, so this American can be more intelligent regarding a rarely practiced custom.
I found that these tefellin can be either worn all day, but are taken off at night and when entering unclean places, such as restrooms. More modern practices though only have them being worn with prayers, which are to be said within 4 hours of sunrise. What you practice depends on which customs you follow.
In this instance, it appears that this boy only wears it while saying prayers. He did not have them on when he got on the flight and the flight crew reacted when he began putting them on, because it appeared to be boxes with wires running to his fingertips, due to the arm straps. The boy and his family do not disagree with how the crew describes the events. The closest thing to a negative reaction they had to say was his grandmother:
The boy’s grandmother, Frances Winchell, who was waiting for her grandson and his 13-year-old sister in Kentucky, said that she hopes that Americans learn a bit more about Jewish customs so that they are not afraid of them.
He was a 17-year-old kid just trying to do what he was brought up to do, and didn't think about it thoroughly. As 17-year-old boys are known to do on occasion. In the end everyone is understanding of what happened and the boy's rabbi even said:
Rabbi Greenberg, the boy’s rabbi, had some advice for future flights.
“I would suggest, pray on the plane and put the tefillin on later on,” he said. “Pray, and fulfill the ritual later.”
Even the rabbi is being understanding here.
The people involved aren't in disagreement with the actions taken, so I don't see what there is to argue about.
And anyone trying to say the flight crew overreacted; this is what it looks like when worn, including the stuff on the arm.
I live near this boy's family and I have never seen anything like that. If I saw someone putting it on I wouldn't know what to think. In the context of being on a plane, which appears to be a favorite terrorist target, I would probably take the cautious route as well. Remember, none of the flight crew are trained to investigate these things or paid enough to confront a potential killer. Had an air marshal been on board then perhaps it could have been inspected, but there wasn't and the crew that were there are trained to not risk their lives.