The following sentence may include an error in word usage. If it does, choose the revision that corrects the error. If it does not, choose "Correct as is." If you're willing to travel in economy class and buy your ticket in advance, you can usually save money on airfare. () If your willing to travel in economy class and buy your ticket in advance, you can usually save money on airfare. () If you're willing to travel in economy class and by your ticket in advance, you can usually save money on airfare. ) Correct as is. ) If your willing to travel in economy class and by your ticket in advance, you can usually save money on airfare