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Frontier Airlines PHX Terminal +1-888-839-0502 Frontier Airlines has a self-service terminal near the North Check-in counter in Terminal 3 at Phoenix Sky Harbor International Airport (PHX). The Frontier Airlines PHX Terminal is a modern state-of-art facility with plenty of services and amenities to comfort passengers during travel. On arrival, it is easy to locate check-in counters of Frontier Airlines that offer travelers a self-checking service using check-in kiosks or also other assistance from staff members. visit us https://www.airofficecounter.com/frontier-airlines-airport/frontier-airlines-phoenix-sky-harbor-international-airport-terminal-phx/