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Customer service and reliability are not normally used in the same sentence with U.S. airlines.
I just flew Delta to Europe and back. On time in both directions. Service was OK. Same with my family’s other two flights to/from Europe on United. In my opinion, international flights are more reliable than domestic.
I think there is no meaningful difference between airlines regarding domestic flights. Airports on the other hand can have different levels of reliability. Again, weather can be a non-issue in the Midwest during winter. Or it can tangle flight schedules in the entire eastern third of the country. It’s unpredictable in winter.
Reliability (opinion based on lots of international and domestic travel):
Detroit - average
Grand Rapids - above average but limited flight availability
South Bend - above average but limited flight availability
Ohare - below average
Newark (if you are in NYC) - average
La Guardia - below average
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