Andrew,
As Sotiris, noted we have just implemented these short class 7 flights. At the moment, the maintenance flights are only applicable to the main division so the 747-400 (Pax) and A340 are the only class 7 birds that can perform these short flights. We will probably roll out more for the other divisions later in the year once we have had chance to evaluate the popularity of the main div flights.
Cheers,