So I bought an extremely pricey domestic ticket IGR-AEP-FTE (over $700 US; flex was only a little more than the others so I went with that).
For some reason, only ARs website lists my flight running that day (AR 1775/AR 1850). Google flights, expedia etc. never showed the flight running on that day (January 5), even when it was much cheaper. Is that something to worry about?