By Alpha,
unfortunately, HUY are in position to play "hardball" with their own balls, never mind anyone else's and Goldtrail's decision, whilst unpopular, was perfectly legal.
Until the place is sold and a more dynamic MD and Marketing team are in place, they'll be at the mercy of whoever comes along with a reasonably sound offer.
Once they're back on their feet they can negotiate sound contracts with operators after which, the Goldtrail scenario shouldn't happen again without HUY being compensated for it, (unless the operator goes tits up).
As a general point to all the detractors of DSA:
It's true that they're having a rough time of it, but in commercial terms, they're still doing marginally better than HUY ever did at it's best.
They have a significantly better airport infrastructure, marketing team at the moment and better facilities to cope with larger and more aircraft at any one time then HUY ever will have.
It's up to the new owners at HUY to turn the place around, concentrate on the deficiencies wherever they lie & they could make the place profitable, but the effect upon DSA won't be significant.