12.	Other acquired rights

At December 31, 2015, 2016 and 2017 the other acquired rights correspond to payments made by the Company after the date the concessions were granted, in order to early-terminate certain long-term leases contracts that existed at that time between ASA and third-party leaseholders in Mexican airports. The rights acquired are comprised as follows:

	December 31, 2015				December 31, 2016				December 31, 2017
Right to operate the charter and general aviation terminal and FBO at San Jose del Cabo airport terminal	Ps.	344,443			Ps.		344,443		Ps.	344,443
Right to operate commercial space at Tijuana airport			15,935				15,935				15,935
Right to operate various space at Puerto Vallarta airport			309,616			309,616				309,616
Right to operate commercial space at Guadalajara airport			93,560			93,560				93,560
Right to operate various parking lots			5,673				5,673				5,673
			769,227				769,227				769,227
Less – accumulated amortization			(220,840	)			(237,537	)			(254,234	)
	Ps.	548,387			Ps.		531,690		Ps.		514,993

Amortization recognized for the years ended December 31, 2015, 2016 and 2017 amounted to Ps. 16,697, in each year. These assets have a useful life until the end of the concession, as its use and operation will continue until the term expires.