Do Etiquette bring you extra favor from Air-hostess on flights?

The etiquette discussed in the article is courtesy between passengers. Unless there is a dispute, it does not really affect the flight crew.

To gain "extra favor" you need to make the crews job easier. You do this by following the rules: keep your seat belt buckled, keep the aisles clear when the are serving, be polite and smile.

No one enjoys dealing with an angry customer, even if you are polite to the guy sitting next to you, but are rude to the flight attendants, do not expect favors from them.

being polite and well mannered will always help, especially with check in staff and crew. These people deal with thousands of people every day and a lot of those are ill mannered from their previous travels, so consideration is always welcomed.