A Sherman man has been arrested for allegedly having a loaded handgun in his carry-on bag.  The Transportation Security Administration did not identify the man who was stopped at Newark-Liberty International Airport checkpoint Tuesday.  The TSA spotted the weapon on the X-ray, alerted police and confiscated the weapon.  The Sherman man was arrested on weapons charges and faces a federal financial civil penalty.  According to a statement, the TSA has found three handguns at Newark airport checkpoints this year.