A 9mm pistol, left, and a .38-caliber revolver, below, confiscated this week at BWI. (TSA)
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It is pretty common knowledge that airline passengers ought not to try to board a plane carrying handguns. This is not some post-9/11 restriction. Since the way-back days when skyjackers were taking planes to Havana, gun-toting passengers have not been welcome

These days, there are signs when fliers approach airport security checkpoints alerting them to the fact that they should not be armed. Yet three times in the past two days, passengers have been stopped at local airports by Transportation Security Administration officers when X-rays revealed handguns in their carry-on luggage.

The latest came Friday, when police said Rosane Strickland Coulon was arrested by  Maryland Transportation Authority police with a loaded .38-caliber revolver in her carry-on bag at Baltimore-Washington International Marshall Airport. That came after Thursday’s arrest of a man police identified as Dwight Tennyson at BWI when the TSA discovered a 9mm handgun in his bag.

A District man was arrested Thursday at Reagan National Airport when he tried to board a flight carrying a .44-caliber revolver. The TSA said Roderick Williams, 39, missed his flight but was allowed to board a later flight — without his gun.

The gun intercepted Friday was the sixth pistol confiscated at a BWI checkpoint  this year. Eleven guns have been detected and confiscated at Reagan National.  Passengers who bring firearms to the checkpoint can face criminal charges and civil penalties of up to $11,000.