'Lost' Star Emilie de Ravin Battles Airline Over Breast Pump

"Lost" and "Once Upon A Time" star Emilie de Ravin says an American Airlines gate agent attacked her because she was trying to fly with her breast pump bag, but the airline is calling it a big misunderstanding.

American Airlines tells TMZ it's still investigating Emilie's claim she had one of her 3 carry-on bags forcibly ripped from her while boarding a flight Thursday at LAX. The extra bag was for the pump, which she's allowed to bring since it's considered a medical device.

Sources tell us the flight was at capacity and the gate agent wanted to have one of the bags tagged, but Emilie wasn't having it. She was eventually allowed on with her pump and the other two bags, but still went off on Twitter.

AA says it's apologized for the inconvenience.