We do have suggested Guidelines listed under the guideline section for both rescue volunteers and pilots:viewforum.php?f=4
There is a link there to follow and see what is required by each state for transport. In most cases, a recent original proof of vaccines and a healt certificate are normally what is asked for but best to check with your veterinarian.
Many of the pilots have their own crates and if not, we have them available if they will contact me directly with the dimensions of the space in their plane. Every plane is different and will likely require a different crate. These have to be shipped UPS so advance notice is needed. We have had rescues and shelters send their animals in crates but please check with the pilots first to see what size. If the crate is a tad small, most animals tolerate it just fine for these shorter trips--they normally curl in a ball and go to sleep anyway. For the larger animals, a harness tethered to the backseat if often used. You can purchase a special travel harness at Petsmart, etc. If you dog is a chewer, some pilots are suggesting that a stronger tether be used for the flight so check with the pilot. They are in charge
I would not feed the animal the morning of the flight, water is fine, and walk them very well before boarding. Please share with the pilot the temperament and any possible quirks your animal may have. Communication with the pilot you are working with is key.
Everyone wants this to be a positive experience for all and thank you for asking for others opinions. Hopefully, someone else will chime in as well.....