When Rashi Chopra, a Delhi-based birthday party organizer, includes basic aeromodelling session as part of a birthday bash, she has more than children on her hands. “It is tough to keep fathers away when such an activity takes place," she says with a laugh. “These basic aeromodelling sessions are hugely popular and the concept has really picked up in last year or so," says Chopra whose company, Full of Life, conducts these sessions at parties for children aged 7 and above. Each child gets an aeroplane kit, which they have to piece together, and then, they get to take the finished aeroplane home as a return gift. On an average, Chopra charges Rs200 per kit.