N639NK (cn 6487) Here’s a first for me: three new aircraft for the database in the same shot. Spirit Airlines (NKS535) at gate A6 before departing for KCMO. Two new Frontier tails are seen behind the Spirit A320. N718FR, an A321-211, c/n 7575, "Cali the Mountain Lion," was delivered 11 Mar 2017 while N311FR, an A320-251neo, c/n 7642, "Mia the Dolphin," was delivered on 16 June 2017.