It's been many years since I have traveled with children that young.  My youngest is 15 now and took his first flight at 9 weeks of age (to Saudi Arabia). 

 

As for their ears, make sure you have something for them to suck on - bottle, pacifier, etc.  I was extremely lucky and my little one slept pretty much the whole flight. 

 

As Alexa said above, for the 19 month old finger foods to snack on is a must.  Airline food leaves so much to be desired, especially to little ones.  Crayons, pencils, coloring books  things to keep him/her busy.  Perhaps a portable DVD player with favorite movies might help as well. 

 

It may actually go a lot easier then you think.  Best of luck on the move.

 

Lisa