Introduction
Sun Country Airlines is set to commence deployments of the Boeing 737-900ER on selected domestic routes from its Minneapolis-St. Paul International Airport (MSP) base later this month. As the largest aircraft in their fleet, the Boeing 737-900ER, surpassing the 737-800, is poised to start operations in 17 days.
Operational History
Originally acquired by Sun Country Airlines two years ago, these Boeing 737-900ER aircraft have not yet flown for the US ultra-low-cost carrier due to being leased elsewhere for operational duties. Now, their time has arrived to serve Sun Country.
Initial Destinations
According to Airline Geeks, Sun Country has set September 26 as the launch date for its Boeing 737-900ER flights. The aircraft will be configured with 189 economy seats and will initially operate routes from Minneapolis/St. Paul to:
- Las Vegas Harry Reid International Airport (LAS), Nevada
- Phoenix Sky Harbor International Airport (PHX), Arizona
During a Q2 earnings call, Bill Trousdale, Sun Country’s Chief Financial Officer, mentioned the anticipated rollout of these planes. He indicated that both Boeing 737-900ERs, previously leased to another airline, will start servicing soon.
Future Expansion
In October, Sun Country Airlines plans to expand its Boeing 737-900ER operations with new routes to Florida, starting with:
- Orlando International Airport (MCO) on October 1
- Fort Myers (RSW) added as a fourth route on October 4
Scheduled passenger flights using the Boeing 737-900ER are confirmed for September and October, with 10 and 76 services planned, respectively. Additional flights may be introduced later this year.
Service History and Fleet Details
The Boeing 737-900ER aircraft were first acquired by Sun Country in April 2023 but were leased to Oman Air until their leases expire in 2024 and 2025. Presently, Sun Country has two of these aircraft back, with three remaining leased.
| Aircraft Type | Number in Fleet |
|---|---|
| Boeing 737-800 | 44 |
| Boeing 737-800BCF | 20 |
| Boeing 737-900ER | 2 |
| Total | 66 |
Aircraft Specifications
Current fleet data from ch-aviation notes that these Boeing 737-900ERs are, on average, 10.4 years old, younger than the 44 passenger Boeing 737-800s in the fleet, which average 17 years. The aircraft, designated as N901SY and N904SY, last flew in December 2024 and August 2025, respectively.
