Shutterstock Save for later Print Download Share LinkedIn Twitter Summer air travel chaos may have repercussions that extend through the rest of the year. London’s Heathrow has taken the most dramatic action to minimize cancellations. The airport has restricted daily capacity for departures to 100,000 seats per day through mid-September. That means airlines would need to slash capacity by 20% beyond the cuts they have already made, according to Official Aviation Guide (OAG) chief analyst John Grant. He says airlines will lose $550 million in revenue with 1.4 million fewer passengers departing from Heathrow. Airport CEO John Holland-Kaye emphasized the cap was needed to manage 40 years of passenger growth in just four months.