Will an airline allow you to fly with this pushchair?

Hiya,
If you mean as with a piece of cabin luggage, then no, this stroller is way too large for that. Many airlines, however, allow for baby luggage (a stroller, a car seat, such things) that is even often free, making you able to take the stroller to the plane, then it is taken by a steward to be put in the back, and then returned when you get off the plane. Also, with other airlines, you can pay for this service. And lastly, you can always have it as checked luggage if nothing else is possible. You will need to check for option with the airline of your choice.