glans tomlinson has hit the nail on the head and I'll verify what he says is 100% accurate. MME, whilst still making a (very) small loss, is in no debt whatsoever.
With regards to Sycamore, if they grow to the levels stated in their business plan we wouldn't need passengers - any flights gained would be merely a bonus, rather than the desperately needed necessity they are now! (For the record, I'm not at all suggesting we shouldn't be chasing airlines for routes!!)
A lack of Immigration at Leeming is the main reason for the charters using us.