The five appointed methods of bodily disposal are:
earth burial or interment;
disposal through fire;
disposal through water;
Each has more variants than I want to list although I should mention that air "burial" (?) includes ingestion by raptors or scavengers.
I thought that Poul Anderson's Ythrians had invented a sixth method but perhaps it counts as a variant of air burial. When "Ferune departed Mistwood..." (Rise Of The Terran Empire, p. 558) (See here):
"His sons tilted the litter. The body fell, and after it the torches." (p. 559)
Bodily disposal consists of flying the litter to a great height, then dropping the body for what might be regarded as its last flight. Presumably it is shattered by its impact with the ground.