I take these things when i travell from india to london or vice vesa.The importance of these things came to light when i experienced my frequent travel visits.Anyways these would be helpful according to me but if you think something should be added to my list please do mention your important list of items that you carry on flight.
1)Pashmina to cover myself like blanket.
2)Guidebooks to familiarize with destinations.
3)Cheese and tomato sandwich incase of feeling uneasiness
5)Deck of cards