I am using a dataset to determine if airline ticket prices are similar across three airlines with classification variables of origin, destination and airline, with the dependent variable of ticket price. I have run a linear regression model in SAS, but I am not sure that is the best way to test.

The null hypothesis is that the prices are the same and the null hypothesis is that they are not the same.

I am having trouble trying to figure out what is the best method to test this or if I am going in the right direction for testing.