I flew out of Richmond this am. Apple watch worked great at TSA had to flip my hand over for the scanner but no issues. The Delta app on the watch however appears to be non functional I used passbook. At the gate to board the plane I had to take the watch off to scan it because their scanners are above and you put what is scanned under 
I am interested to hear how other airlines are
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Forgot to add I wore it all the way through security no issues
I am interested to hear how other airlines are
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Forgot to add I wore it all the way through security no issues