Please let us know. I think they are using their own internal lat/lon mapping to encode images. I was able to get some images using their API:

https://ddnhehdam2vn0.cloudfront.net/malaysiaair2014_02/18/2...

https://ddnhehdam2vn0.cloudfront.net/malaysiaair2014_02/12/3...

but most of the numbers return 403. Above links roughly match upper left and lower right corner.