NCIS: Season 7, Episode 13

7 - 13: Jet Lag

While transporting a government witness back from Paris, Tony and Ziva's assignment quickly encounters turbulence when they learn a hit man may be on their flight home. With the help of the rest of the team on the ground, as well as a botched attempt on the witness's life, Tony and Ziva deduce that the assassin is one of the flight attendants. After successfully apprehending her, they discover that the man who hired her was in fact the witness's fiance, who would be implicated in her testimony but in the process of arresting him, Gibbs's right arm is broken, forcing him to do everything with his left hand for the time being.