As far as I can tell, Sycamore is acting as a tenant, paying rent to landlord DTV airport in return for use of a hangar.
It would seem that the tenant has been either unable or unwilling to pay the rent in full and on time.
Initially one might expect a landlord to be a bit forgiving - all businesses go through a bad month now and again and one sometimes has to be a bit flexible on things. If this happens on a regular basis, a landlord will typically give an ultimatum to the tenant - pay up on time in full, or I will evict you.
A landlord who continually forgives regular underpayment or late payment of rent without enforcing a penalty is in effect telling not just the tenant in question, but all other tenant of that landlord (eg companies renting retail units in the terminal) that it's not necessary to pay the rent each month because nothing bad will ever happen.