Redirected to another airport


Hi. I use to watch Flight Aware almost every day and I like it a lot. In mid August I was a passenger on COA69 from Stockholm to Newark (EWR). When I look today, Friday November 5th I saw that this flight, COA123 and AAL171 landed on Gander Intl in Eastern Canada. Now I am very curious, why did they. Does anyone know ? Best from Christer in Sweden


Most likely causes are a medical emergency or winds stronger than forecast


Or delays at destination that would require excessive holding.