Top 5 to entertain kids at the airport and during the flight: 

1. Sticker Book

2. Drawing Stencil Set

3. Playdoh

4. Loom Bands

5. Finger puppets

Moreover, all the listed toys don't take lots of space in your luggage.

Also, it's highly interesting to find out about a social experiment led by Professor Robert Winston. He found that old-fashioned fun is all you need to keep children happy in-flight-contrary to popular belief.

The research comes as parents revealed that their biggest concern when flying was keeping their children entertained, with 60 percent admitting they fail to keep kids distracted for more than 30 minutes. A quarter of parents surveyed said they worried about their children disturbing other passengers, while more than half were nervous about disrupting their youngster’s sleeping pattern.

British Airways conducted the social experiment in response to the survey, by placing 30 youngsters on a flight for two hours with a selection of toys. The children, aged two to 10, were given 90 minutes of playtime and observed by scientist and TV personality Robert Winston and a team of educational psychologists. The surprising findings revealed that it was actually the most simple toys that kept the children occupied for the longest.