Travelled back from JFK many moons ago with our young son (was less than 1 year old). We got on and made ourselves comfortable.

2 young ladies came down the cabin, and went into the row directly in front of us, and one said to my Son "I hope you are not going to keep everyone awake all night" so I politely grinned at her and looked away.

After take off, and meal service (all very quick) lights out, and then it started......

NON STOP COUGHING!!!!! and guess who from, yeah her in front!

Nothing we could do, apart from maybe next time charter a private jet. Suggest some people do this if they have a problem being in a confined space with lots of other people. Alternatively, use your ear plugs.