If the trigger to being labeled as 'suspicious' is you carrying a weapon on a plane, then people are less likely to find it unreasonable. If the trigger is the

If the trigger to being labeled as 'suspicious' is you carrying a weapon on a plane, then people are less likely to find it unreasonable. If the trigger is the simple act of reading a book, then, no it is not reasonable and should never be. At the _very_ least the airline should issue a full apology and reconsider their shoddy pseudo-security training.