if you look at the AA flightplan below you will see that AA went DCT from DUB VOR via LYNAS waypoint straight into MAN...
The route part of a FPL should begin with the endpoint of the SID (or airway from there) and end with the first point of the STAR. It's not necessary to insert a DCT, but some operators seem to, particularly if unfamiliar with the rather exacting European IFPS. As 055166k says, just because you see DCT on the FPL, it doesn't mean that the SID/STAR will not be flown.