Aircraft used for Patriot Express flights are similar to commercial passenger aircraft with similar noise levels. Military cargo aircraft can have higher noise levels (e.g. C-130). Foam-type Ear plugs are normally distributed by the air crew but it's advisable to bring your own in case. Noise levels on smaller aircraft (e.g. C-21 Learjet Type) should be less than cargo aircraft. Since you may not be able to predict the type of aircraft you’ll get a seat on you may want to be prepared with some ear plugs such as Macks Ear Plugs or Peltor Ear Muffs (suggested by other Space-A travelers with young children).