Several accidents in the recent years have revealed how important --and intuitively expensive-- SAR operations over seas can be.
Need for daily government agencies / military flights in the first weeks after the accidents, need for underwater search.
SAR managed by other countries than the registration country of the aircraft.
Crewmembers of an Indonesian Air Force NAS 332 Super Puma helicopter over the Java Sea, Indonesia, 2015.
Without entering into too much details:
How is SAR for civil aircraft agreed globally?
Is that under ICAO umbrella?
Is it shared with maritime SAR or other organizations?
How is SAR responsibility shared between countries worldwide?
Is a map with responsibility boundaries available?
How is SAR funded?
Are operators (their insurances) liable for costs?
Is it a service provided for free, if so to which extent?
How is the decision to stop active search taken?