(a) A person who stores, fuels, repairs, or performs maintenance work on an aircraft has a lien on the aircraft for:
(1) the amount due under a contract for the storage, fuel, repairs, or maintenance work; or
(2) if no amount is specified by contract, the reasonable and usual compensation for the storage, fuel, repairs, or maintenance work.
(b) This subchapter applies to a contract for storage only if it is:
(1) written; or
(2) oral and provides for a storage period of at least 30 days.