Some of the best items to consider include:
A sturdy, well-ventilated carrier or crate that is the right size for your pet. The carrier should be big enough for your pet to stand, turn around, and lie down comfortably, but not so big that it can move around too much.
A comfortable bed or mat for your pet to lie on inside the carrier. This will help to keep your pet comfortable and relaxed during the trip, and can also help to prevent it from getting motion sickness.
Adequate food and water, as well as any medications or supplements that your pet may need. Be sure to pack enough supplies to last the entire trip, and consider bringing a collapsible water bowl and a travel-sized food container for easy feeding and watering on the go.
A leash and collar, as well as any identification tags or microchips that your pet may have. These items are important for keeping your pet safe and secure during the trip, and can help to reunite you with your pet if it gets lost.
A first-aid kit, including items like bandages, disinfectant, and tweezers. This can be helpful in case your pet gets injured or sick during the trip, and can save you a lot of time and stress if something unexpected happens.
Overall, the best items for your pets for transportation by airplane or car are those that will help to keep them safe, comfortable, and well-fed during the trip. By packing the right supplies and equipment, you can help to ensure that your pet has a smooth and enjoyable journey, no matter where you're headed.