Airports / St Clair County International Airport
St Clair County International Airport(KPHN)
Port Huron, United States
Last updated: Mar 28, 2026
Activity Summary
Airport Patterns
Emissions up 1266% vs prior period — significantly busier than prior period
Charter/owner classification not available for this airport's flights
Spikes
Significant deviations from this airport's baseline in the selected period.
CO₂ Above Baseline
54t
Signals Detected
5
Highest Severity
High
Elevated activity Apr 3, 2025 – Apr 9, 2025 — 11 flights in 7 days vs baseline of 2
11 flights recorded in a 7-day window, exceeding the airport baseline of 2 flights per week by 377%.
12.3t CO₂
Elevated activity May 30, 2025 – Jun 5, 2025 — 5 flights in 7 days vs baseline of 2
5 flights recorded in a 7-day window, exceeding the airport baseline of 2 flights per week by 117%.
13.6t CO₂
Elevated activity Jun 14, 2025 – Jun 20, 2025 — 5 flights in 7 days vs baseline of 2
5 flights recorded in a 7-day window, exceeding the airport baseline of 2 flights per week by 117%.
16.8t CO₂
Single high-emission departure N371FP → KLXV on Jul 27, 2025 — 11.5t CO₂, 91% of day's total
Aircraft N371FP departing to KLXV produced 11.5t CO₂, representing 91% of all airport emissions on Jul 27, 2025.
11.5t CO₂
14-day gap in recorded activity ending Nov 23, 2025
Airport had 14 consecutive days with zero recorded flights before activity resumed on Nov 23, 2025.
Route Map
KPHN to KLXV · 1,261 miles
Total Flights
1
Avg CO₂/Flight
11.5t
Total Emissions
11.5t CO₂
KPHN to KSFO · 2,112 miles
Total Flights
1
Avg CO₂/Flight
10.9t
Total Emissions
10.9t CO₂
KPHN to KOAK · 2,101 miles
Total Flights
1
Avg CO₂/Flight
10.5t
Total Emissions
10.5t CO₂
KPHN to KRNO · 1,934 miles
Total Flights
1
Avg CO₂/Flight
10.1t
Total Emissions
10.1t CO₂
KPHN to KLAS · 1,790 miles
Total Flights
1
Avg CO₂/Flight
9.6t
Total Emissions
9.6t CO₂
KPHN to KAVQ · 1,718 miles
Total Flights
1
Avg CO₂/Flight
9.0t
Total Emissions
9.0t CO₂
Recent Flights
10 total flights recordedShowing most recent flights — not filtered by viewing period