anecdotally, on a JAL flight between Tokyo and London (for which Russia taxes every passenger individually, story for another time), I saw a bunch of manga on the in-flight entertainment system, and people were actually using it to read. cooler still, seeing both the parents and their children reading different manga.
i’ve tried a couple of these services, but they were quite subpar.
I wouldn't want to read it on a non E-ink screen, or have to scroll within a single page though.
I use the SimpleComic reader on OSX, first removing the menu and then fullscreening it. This requires me to download the manga beforehand. It works for me since I don't read that much manga.
Now that I have an ipad I wonder how well it could work.
But short search says "Manga Storm CBR" is according to your demand. Search for cbr, which is the common fileformat for comic-archives. You can also widen the search and search for comic-apps or reader-apps in general. Manga seems to be often a bit to specific in those cases.