2025-01-11: Delta AL A333 (N820NW) and United AL B739 (N68891) experienced a loss of separation during approach to rwy 8 (resp 7R) at Phoenix-Intl AP(KPHX), AZ. Flight #DL1070 from Detroit and #UA1724 from San Francisco followed their TCAS resolution advisory. Both acft continued for a safe landing.