In order to register an aircraft, the owner must provide the FAA with a signed registration application on FAA form 8050-1, along with proof of ownership of the aircraft, and a $5 registration fee. Ownership proof usually takes the form of a bill of sale, but other types may also apply, such as a certificate of repossession, or a court order. The owner’s name on the registration must identically match that on the proof of ownership. Until 2016, only original ink signatures were accepted, but now digitally signed and verified documents may also be used. In order to register, an applicant must meet an eligibility test as one of a, a US citizen, b, a US permanent resident registering as an individual, or c, a non-citizen corporation owning an aircraft that is based and primarily used in the US.