SAN ANTONIO -

Two passengers flying on Southwest Airlines' newest Boeing 737-300 put their finest suits on for the aircraft's maiden voyage, although, it helps when you're wearing the suit at all times.

Pete and Penny, two penguins from SeaWorld, took a flight on Penguin One, as part of a celebration of 25 years of a partnership with Southwest Airlines.

"They only fly once, and that's when they're on a Southwest Plane," said Dan Decker, the president of SeaWorld San Antonio Park. "So they typically don't, but they enjoy our flights, we thought maybe the delay coming off was that they got so comfortable they took a nap."

The airplane joins 12 other 737s in the Southwest fleet carrying a unique paint scheme. Penguin One depicts the gentoo penguin species, one of the species found at SeaWorld Orlando's new Antarctica: Empire of the Penguin.

The partnership between the two companies dates back to 1988, which began when SeaWorld opened in San Antonio and introduced a new Boeing 737, Shamu One.

In celebration of Penguin One, for three days only, customers will receive a special offer when book a flight, hotel and theme park vacation package for three more nights to select SeaWorld parks in Orlando, San Diego, or San Antonio. Customers will save up to $100 per hotel reservation ($20 per night) when using promotion code 72HRSEA at the time of booking.

For offer details, visit http://www.southwest.com/html/promotions/click-n-save-sale-swav.html.