Google Flights is one of the go-to tools for most folks looking to book the revenue flights. The various ease-to-use features help easily find the fares to the destination (or near by destination for creative souls). Since the ITA Matrix is at heart of the Google Flights, the same flight results can result from ITA including more details such as "fare class" as well as "Fare Rules" which are usually not shown by Google Flights. Using the "Fare Rules" details can help find out the details of the fare including the change/cancellation fees which vary by carrier.
The interesting aspect is when the flight is operated as "Code Share" flight. For e.g. a United flight is code-shared with its star alliance partners Lufthansa. Similarly carriers can have code-share agreement with another carrier in the market or route where they do not operate and this can represent the same flight being sold with different "Fare Rules" based on where you purchase your ticket from. There are certain routes which are code-shared by American Airlines and Alaska Airlines. Since Alaska Airlines has a very generous cancellation policy where you can change or cancel the flights up to 60 days before the date of departure the same could potentially apply to code-share flights on American Airlines. This can be easily found by looking at the "Fare Rules" from ITA Search.
For e.g. below is the one way flight search in Google flights from San Jose, Ca (SJC) to Dallas Fort Worth (DFW) for Dec 15, 2017. As you can see the American Airlines flight AA 1231 is marketed by Alaska Airlines as AS 6719. To top it the price is significantly cheaper on Alaska Airlines (Of-course the tickets would be booked in different booking class based on which carrier is selling the tickets) but still if you just care about going from Point A to Point B that's a good price difference. Also American Airlines charges whooping $200 as cancellation/change fee on non-refundable paid fares where as Alaska Airlines cancellation/changes are free up to 60 days before the date of departure or just $125 (assuming you do not have status with Alaska Airlines) till the date of departure.
So if you book the flight using Alaska Airlines you can get:
Of course there are few downside to this:
The next time you book the flight on any airlines and want to make sure you do not have to pay hefty fees do check the "Fare Rules" to determine Cancellation/Change fees. Also if the above Alaska Airlines booking downside seems minor to you for a code share flight between American Airlines and Alaska Airlines, select Alaska Airlines for booking to get great cancellation/change policy.
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