Summarize this article in one sentence.
Different airlines may have different policies regarding transporting a person’s ashes during a flight. You may be able to carry your loved ones’ ashes with you as a carry on, or you may need to check the container with the rest of the checked baggage.  Some airlines require cremated ashes to be transported via the cargo hold.  If you have the option of several flights, call each airline individually and choose the one which suits your needs the best. Some countries have no restrictions or requirements for travelling with cremated ashes, while other countries will not allow them to enter the country at all. When you call the consulate or embassy, ask for a full briefing on travel requirements for cremated remains. Since legislation can change with short notice, and websites are not always updated right away, it’s best to call rather than to rely on information you find online. If for some reason you can’t arrange a flight that will allow you to bring the ashes with you, contact the funeral home that prepared the ashes and ask them to advise you on your next step. Some countries will only allow ashes to be sent to and from licensed funeral directors. If you’re travelling internationally, you may need the funeral director to handle the travel arrangements. Before you undertake a trip to scatter your loved one’s ashes, be sure you will be allowed to scatter their ashes in the intended spot. Ask for written permission if the destination is on private property, and be sure you know the restrictions if you plan on scattering the ashes in a national park or other protected area. In Yosemite National Park, for instance, visitors are allowed to scatter ashes as long as it’s away from the public and at least 100 yards (91 m) away from water.

Summary:
Contact the airline directly to see what their policies are. Contact the embassy if you are travelling to another country. Ask the funeral home for advice if you need additional help. Secure written permission if you plan to scatter the ashes.