Requirements:

Transport of Human Remains

1. Certified copy of Death certificate
2. Burial/Transit Permit
3. Passport of decedent
4. Embalmer's affidavit
5. Letter of non-contagious disease from local health authority
6. Funeral home letter stating: 1) only remains are inside the casket 2) flight itinerary; 3) consignee's name, address, and telephone number;
7. Hermetically sealed Casket
8. Air tray as outer shipping container

Consulates: http://www.state.gov/s/cpr/rls/fco/164211.htm#png

Embassy: http://www.pngembassy.org/