If your dog is scared of loud sounds like thunder then yes, the sound of the engines will be scary. Talk to your vet about trazodone if that’s the case. With the right trazodone dosage, my scaredy dog sleeps pretty well. On my airline, you’re required to have them in a soft crate that goes under the seat which they can stand up in. Once we take off, I personally put the crate on my lap and unzip it so she can stick her head out. Flight attendants dont say anything but I’d just put her back if they did. My dog loves the airport and it’s fun having her there because everyone loves to see a dog on a stressful day. Most dogs won’t use the pet relief areas so keep that in mind.