The Sats won't be just focused on many little areas, it would take a huge sweep or picture of thousands of square miles at once.
All the data would be stored for later retrieval if needed.
To be able to monitor an entire ocean daily at the resolution fine enough to spot an airplane or wreckage would require a ginormous amount of storage and transmission capacity.
We are talking about probably 2 - 4 petabytes (1000 TB = 1PB) of data every day if you use the entire Google maps archive of 20PB as a benchmark.
Can a satellite even transmit 2-4 PB in a day?
My ideal way of finding a plane crash in the middle of nowhere would be using infrared detection satellites designed for IR emissions. Presuming these satellites are just looking everywhere all of the time, then having a fiery blip in the Indian Ocean might pique some interest or set off some kind of warning or task for who ever runs these things, NORAD maybe?
"Although SBIRS was designed primarily for missile defense purposes, its short- and mid-wave IR sensors can detect any significant infrared event on the globe, including explosions, fires, and plane crashes. SBIRS provides satellite IR data on thousands of non-missile related events every year. The National Air and Space Intelligence Center keeps “a catalog of signatures—electromagnetic and IR—of aircraft, missiles and other military hardware operating globally.” This can be used to understand what’s going on in crowded operational theaters where there are many actors at play."
The Space-based Infrared System (SBIRS) is a constellation of integrated satellites in geosynchronous orbit (GEO) and high elliptical orbit (HEO) and ground-based data processing and command and control centers. This system is designed to provide early missile warning, cue missile defenses...
missilethreat.csis.org
"The search resumed at 6:15 that morning, and the airplane was finally located early that afternoon-45 miles to the northeast of Scotty’s Junction. Locher, leader of the search team, later noted that
the aircraft could have been located much earlier if they had had access to a variety of existing information–including the observation of a pilot of a flash in the area of the crash
and the detection of a hot spot in the same vicinity by a US satellite (presumably a Defense Support Program infrared sensor)."
From the U-2 to the F-117A, it's a dicey issue deciding what to say and do when classified airplanes g
www.airandspaceforces.com
I have no clue about these matters or have any military experience, but it is presumable that the the answer is out there and classified, which it probably should be. The apparatus that can provide the answers is not for civilian use and in the big scheme of things this event is not that important.