What type of aircraft is N521SY?

N521SY is a Embraer S A ERJ 170-200 LR with 88 seats, according to the FAA aircraft register.

Which airline flies N521SY?

SkyWest Airlines (OO) flew N521SY most recently, according to US Department of Transportation flight records for July 2026.

Where does N521SY fly?

Its most frequent route in the last 12 months was Los Angeles to San Francisco (64 flights). It flew 1,438 flights in total, about 120 a month.

N521SY was built in 2022, so it is 4 years old.

Is N521SY usually on time?

82% of its flights from August 2025 to July 2026 arrived within 15 minutes of schedule. Punctuality depends far more on the route and the airline's day than on the aircraft itself.

US aircraft · OO

N521SY

Embraer S A ERJ 170-200 LR, SkyWest Airlines

N521SY is a Embraer S A ERJ 170-200 LR flown by SkyWest Airlines, built in 2022. From August 2025 to July 2026 it flew 1,438 flights, most often Los Angeles to San Francisco, and 82% arrived within 15 minutes of schedule.

1,438

flights in 12 months

82%

on time (within 15 min)

airports

4 yr

age

August 2025 to July 2026. Flights from US Bureau of Transportation Statistics on-time records (public domain); aircraft details from the FAA aircraft register.

Where N521SY flies

Los Angeles to San FranciscoLAX to SFO64 flights
San Francisco to Los AngelesSFO to LAX64 flights
Phoenix to PascoPHX to PSC23 flights
Los Angeles to Oklahoma CityLAX to OKC22 flights
Oklahoma City to Los AngelesOKC to LAX22 flights
Phoenix to MedfordPHX to MFR18 flights
Medford to PhoenixMFR to PHX18 flights
Phoenix to TucsonPHX to TUS18 flights
Durango to PhoenixDRO to PHX17 flights
Phoenix to DurangoPHX to DRO17 flights

Its most frequent routes over the period. Each links to that route's punctuality page.

Month by month

Share of N521SY flights arriving within 15 minutes of schedule, by month. Green is the best month, orange the worst.

See the figures

Month	On time	Cancelled	Flights
August 2025	93%	0%	138
September 2025	84%	5%	121
October 2025	80%	0.9%	109
November 2025	79%	2%	99
December 2025	80%	0%	137
January 2026	80%	0%	98
February 2026	87%	0%	93
March 2026	94%	0%	159
April 2026	87%	2.6%	116
May 2026	73%	0%	102
June 2026	75%	0.9%	115
July 2026	71%	0.7%	151

Questions and answers

What type of aircraft is N521SY?: N521SY is a Embraer S A ERJ 170-200 LR with 88 seats, according to the FAA aircraft register.
Which airline flies N521SY?: SkyWest Airlines (OO) flew N521SY most recently, according to US Department of Transportation flight records for July 2026.
Where does N521SY fly?: Its most frequent route in the last 12 months was Los Angeles to San Francisco (64 flights). It flew 1,438 flights in total, about 120 a month.
How old is N521SY?: N521SY was built in 2022, so it is 4 years old.
Is N521SY usually on time?: 82% of its flights from August 2025 to July 2026 arrived within 15 minutes of schedule. Punctuality depends far more on the route and the airline's day than on the aircraft itself.

See how SkyWest Airlines compares with every other US airline.

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