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Kourtney Kardashian, Mason Disick, Penelope

Brian Prahl / Splash News

Penelope Scotland Disick is just two months old, but she's already quite the jet-setter!

Kourtney Kardashian and Scott Disick's little girl took her first cross-country flight (Los Angeles to New York) Sunday night. Joined by her mom and big brother Mason, Penelope looked curious but relaxed as Kourtney pushed her stroller through JFK Airport.

Kourtney, 33, was dressed for comfy traveling: The brunette beauty wore aviators, a blue Monika Chiang button-down, black jeans and combat boots. Mason, 2, went with a sporty ensemble, pairing sneakers and Nike pants with a white polo T-shirt.

But papa Scott shouldn't get too comfy with just two kids. On Sunday's Keeping Up With the Kardashians, Scott told Kourt, "I don't want to be outnumbered by my children."

Kourtney, however, doesn't quite see eye to eye with her man. "I'm not going on the pill," she said. "I don't believe in it."

Hey, with genes like that, who wouldn't want more babies?!

Don't miss the season finale of Keeping Up With the Kardashians Sunday at 9 p.m. on E!