"Any preferences for species, sir?" the WereAir check-in agent asked. "Any  existing allergies to animal allergens?"
Alexis was only half paying attention. A stunning white-furred foxgirl had caught his attention as her two-foot-tall body strained to haul her three-foot-tall luggage across the airport terminal. Alexis turned back to the man behind the check-in counter. "Um, so I can choose anything?"
"Almost, yes. There are surcharges for each form on a per-kilo basis. Heavier forms, more charge. We cannot accommodate all requests, though we try our best."
Alexis chewed his lip. "I'm not really sure. At first, I thought a bird form would be good, since, y'know, if there was an accident, I could fly. B-but birds are fragile. I'm already pretty nervous about the shrinking and, with the hollow bones, someone might sit on me. So then I thought a cat. They land on their feet, right? If the plane blows up... Did you know cats have a 90% survival rate from falls of up to 20 stories?"
The WereAir agent smiled. "First-time flyer? Anxious?" Alexis nodded. "Might I recommend our Komodo Courier upgrade? Seven feet tall with an armored hide. You'll never feel so secure in your life."
"Wow, that's great!" Alexis exclaimed. "But... how much...?"
"That's the best part. This upgrade comes at no extra cost. The only caveat is that you will be asked to escort several other passengers and biological samples on their flight on behalf of WereAir, ensuring they arrive safely at their destination."
It didn't sound like too much hassle, so Alexis readily agreed. As the agent tapped the controls for the morphogenetic field converter, Alexis felt a tingling energy vibrating through him, and a tightness in his clothing. The seams burst along his biceps and thighs, the seat of his pants bursting open. The base of his spine elongated into a thickly muscled tail.
"Just be sure to duck as you enter the plane," the agent laughed, peering up at Alexis looming higher overhead, his head rising upon a serpentine neck with the snap and crackle of vertebrae.