Second Star is a science fiction re-imagining of the classic Peter Pan and Neverland adventure. Neverland is a futuristic planet, Pan is the bad guy and the Lost Boys fly using anti-gravity body harnesses. (these harnesses emit glowing green and yellow hued bands that flow around the person flying)
In the first book, John (a fighter pilot from Earth's near future) is sucked through a portal in the middle of the sky and into Neverland, where he is found by Michael and Tom. They must then evade heavily armed Regency soldiers (Pan's men) as they try and hunt them down. The first thing they do is jump from a floating refinery about the city (Michael carries John on his back) and all three fly down to the city below.) It is a very large city, home to a few million.
The aircraft I imagine have the body style of maybe a blackhawk helicopter, with two powerful engines mounted on struts on either side of the aircraft.
John, Michael and Tom destroy one of these as they escape capture and when they are cornered atop an old parking garage they are saved by a teenage girl, Bella, (whose hair is burnt orange and in pigtails and she is very feisty) and she has a "tri-barrell" beam weapon that blasts the enemy aircraft out of the air.