As part of a broader app update, Airbnb on Tuesday introduced a new feature that allows travelers to book services and experiences, like getting a massage, haircut, or chef-prepared meal, or taking part in some activity. These new offerings can be added to your stay, but they can also be booked independently, Airbnb says.For instance, you could book a tour in a city you’ve traveled to, but where you’ve chosen to stay elsewhere, the company suggests. This is not the first time Airbnb has tried such a featu ...