An Iowa favorite returns this weekend for the 15th year. The Quad-Cities airshow held at the Davenport Municipal Airport will feature the Thunderbirds performing team and their Canadian counterparts, the snowbirds. Organizer Margy Hopper says thousands of people will come to watch.She says the attraction is curiosity, the “fantasy of flight” and a desire to get a good look at the airplanes. At an airshow, she says they can get up close, see the planes and talk to pilots. Hopper says you don’t have to be a pilot to bring the family for the annual airshow.With weather looking good, Hopper says the crowd’s anticipated to be in the “tens of thousands.” Her husband, private pilot Ken Hopper, was injured in a crash of a helicopter he was flying a year ago but has recovered and is head organizer of the airshow.