Welcome to FT!

It's a good idea, when first coming to any new discussion board, to familiarize yourself with its organization before posting. The "Suggestions" part of FT is for people to make and discuss suggestions about FT itself, as you'll see from reading some of the other posts here.

As for your question: each airline has its own rules. Each airline has its own FT forum as well. If you'd like a fully informed answer to your question, please post it in the appropriate airline forum. Information such as the fare class of your ticket (not just the class of service, but the specific fare class within it) will help, as the answer often depends on that as well.