Allow airlines to fly W patterns

[jezbanks]

Where there are bases with some LH demand but not enough for many based planes, would it be possible to allow a W pattern to be flown.

For example:

FACT > EGLL
EGLL > FADN
FADN > EGLL
EGLL > FACT

Of course both FACT and FADN would need to be the same size base.
But it would mean you would be able to split a LH fleet across two or more bases.

Would extend the game, make smaller airports more viable and add interest to scheduling