How are interline agreements for air ticket booking are different from the code share agreements?

You must have heard of the code share agreements between the airlines. As a result of these agreements amongst the airlines, you do air ticket booking on one flight but are flown on the other airline, which might surprise you when you take the boarding pass. The code share agreements are quite common among the airlines. These give the benefits of extended market reach and better seat factors to the airlines. However, the interline agreements are relatively rare as compared to code-share ones. Both these types of flights can have flight numbers different from the one of primary airline. But, there are some basic differences between the two.

In case of the code share flights between the source and the destination in a multiple-leg trip, the flight number of each airline with passengers is different. But, in a similar situation, the interline agreement provides the same flight number for all the airlines.

Another major difference between the two is that the code share agreements allow for honoring the frequent flyers programs of airline on which cheap flight tickets are booked with the code-share partner carriers. So, when you are flying on the code share flight, your miles will keep on getting aggregating. Further, you can redeem these points on these carriers as well. But, in case of interline agreements, the rewards programs of booking airline are not honored for those segments of journey whose flights do not have code share agreement with one another.

Yet another difference is with respect to the baggage which needs to be checked-in. In case of code-share agreements, the baggage needs to be checked-in at each segment of flight since these are treated as separate flights. However, in case of the interline agreement, the baggage follows you wherever you go obviating the need for checking-in all the time.