CR2, at risk of upssetting the mod. I've gotta disagree slightly with your statement.
I'd say the A300 is better at short haul. While the Greasy 8 is still a great hauler, it hates short sectors. Put them on 1-1.5 hour sectors & it will break after 2 or 3. On the other hand, load it to the gunwales and send it on 5-6 hour sectors and it becomes a clockwork mouse, just keeps on rolling.
The 'bus, on the other hand, relishes several short sectors per night, even the -600.
On that basis I'd say the DC8 & A300 are complimentary with overlaps. Anyway, a bit like the DC3, with what do you replace a DC8 - another DC8.
RT