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In late March, a dog died after being stowed in its carrier in an overhead bin on a United flight. Soon after, United announced that it would suspend reservations for cargo transport of pets while it reviewed its program, a process it completed at the end of April.

Airlines publish guidelines and rules on their websites for traveling with or transporting pets. The rules differ for domestic and international travel, as well as for service animals.

Here are some highlights for domestic travel:

Book early

Space for pets carried on or checked as cargo is limited and offered on a first-come, first-served basis (excluding service animals), and traveling with pets isn’t allowed on all types of aircraft.

Call ahead to check your itinerary and book your pet. Service animals, and emotional or psychiatric support animals, fly free. They must fit in your lap, at your feet or under the seat, and they can’t block the aisle or an emergency exit.

Owners are generally required to notify the airline at least 48 hours before travel, and submit a note from a doctor or licensed medical professional confirming the passenger’s disability and need.

United and Delta also require owners to submit a signed health certificate or immunization record for the animal, plus a signed confirmation of animal training.

Airlines prohibit puppies or kittens younger than 8 weeks from traveling. They have varying requirements for proof of vaccination and health certificates from a licensed vet.

Carriers and crates must be sized and constructed to certain standards to ensure the animal’s comfort and safety. Even if a carrier or crate from a retailer is labeled “airline approved,” check the specific airline’s requirements. If you can, acclimate pets to their carrier or crate two to three weeks before departure.

Carry on and cargo

You can carry on a dog or cat if it fits in a carrier small enough to fit under the seat in front of you. The “kennel” counts as one piece of carry-on luggage. Airlines will charge a flat, one-way fee of $95 to $125 at check-in for each segment of your flight.

American and Delta charge $200 per crate for cargo customers. United charges by weight, from $201 for 10 pounds or less, to $630 for 150 to 200 pounds (and $60 more to go to or return from Hawaii).

Many airlines prohibit the transportation of brachycephalic breeds — short-nosed dogs and cats, such as pugs, boxers and Himalayans — that are prone to respiratory problems that may be exacerbated by stress and changes in air quality and temperature in a cargo hold. Overweight animals and those with preexisting health conditions may not fare well in cargo, either.

The good news is that pet injury or death during air travel is rare. In 2016, 40 out of 506,994 animals transported as cargo on major passenger airlines died or were injured during the trip, according to the U.S. Department of Transportation.

© 2018 The Kiplinger Washington Editors, Inc. Distributed by Tribune Content Agency, LLC.