Headphone splitter so can use two sets of headphones on same device.

A pillow can be good on flights (often they only provide mini ones and it makes it more comfy if you have a child laying across you) - but depends if you have capacity to carry. Check on the plane and work out how you will be seated - e.g. 4 all together or if only has rows of 3. Recent flights (5 hrs) planes have been 3 and 3, and we end up with me with the two kids and DH across the aisle. Although it might seem better to have 1 adult and 1 child each side of aisle - you may then have someone else in your bank of three - and makes it not so easy for the kids to stretch out and lay down once up in the air. With a bank of three, I sit up, DS lays mainly across me (he likes to dangle his head in the aisle and get it hit by the trolley, strange kid :-)) and then DD lays across the other two seats and attempts to not get kicked in the head by DS.