Originally Posted by JSWolf
That is what FlightCrew says is incorrect when it's actually correct.
Well, according to the ePub 2.0.1 spec
Any font files included in an OPS Publication must
be included in the OPF manifest
with appropriate media type (application/vnd.ms-opentype
for OpenType fonts).
Note that passing epubcheck does not mean everything
is fine, it just means that it passes epubcheck. (Likewise for FlightCrew.)