Yes, you can. However, you will need to increase the timing a bit because the loaf pan will need to heat up before transferring that heat to the meatloaf and cooking it. The amount of time will depend on the type of pan used. Silicone is the poorest conductor of heat, so it will take longer than using metal or glass pans. Putting the meatloaf mixture into a pan (if it doesn't have holes) will not allow for the grease to drain off, so your meatloaf will have a slightly different texture. Always make sure the pan you use is rated for the temperature you plan on using to cook your meatloaf. Most oven rated pans will work fine in your air fryer.