What next- the tefillin bomber.
Nobody's getting on a plane with bad stuff inside the tefilin. They can see inside. And if some terrorist actually DOES try to sneak dangerous things inside tefilin onto an aircraft, you can be sure Israel will nuke Saudi Arabia, Jordan, Lebanon, Egypt, Syria, and Gaza. To create a situation for Jews to have to open up their tefilin every time they travel will be a tremendous burden and embarrassment. It would cause SOOOOOO many problems.