You're right
DC3_Dave, they can't roll up the runway - because it doesn't belong to them.
Joking aside, the die is certainly cast. They are commited. How much cash have they got? Lots is the answer. Stobart Group has substaintial cash in hand. They could keep SEN operating for many years to come. Whether institutional shareholders will consent to them burning millions on a airport
and more dangerously an airline is another question.