After all of the confilicting information about which medication and techniques to use for prevention of ear pain for children on flights, I decided to to call the pediatrician for the best solution. He said to use "Little Noses" for infants and children. It must be the decongestant nose drops, not the saline ones. It is the ingredient phenylephrine hydrochloride which is a nasal decongestant that is needed to open the eustachian tubes. It is 90% effective whereas Sudafed is found to be only 30% effective. Use the spray in combination with chewing candy or gum or even with the EarPlanes if you would like additional protection. Robitussin is not an effective drug. The guaifenesin ingredient is not a decongestant, it is an expectorant. It is used to break up congestion and mucous. Guaifenesin thins mucous, increases lubrication of the respiratory tract (lungs, nose, and throat), and increases the removal of mucous. Therefore, is not the drug of choice.
For adult relief, Afrin Nasal spray which has the nasal decongestant oxymetazoline hydrochloride is the way to go.
Just wanted to clarify all of the information here. Thanks.