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The flight hosts that will be serving you during the flight are hospitality veterans and seasoned professionals, not just flight attendants. Be very kind to these people and use your manners extensively. They will be doing everything they can for you, and it's simple protocol to treat them with reverence. It's most likely that you will be seated next to someone in most aircraft's. Although, you will have your own room and space to enjoy the flight, it's very respectful and kind of you to introduce yourself to people within reach. This could lead to some very interesting conversation that will will  make time fly! You can learn a lot from others, even more so the people that fly in first class due to their presumed success. Show that you are having a good time by smiling at service attendants and other passengers while you reside in the first class area. It's evident that most people in First Class will be very friendly and excited due to the relaxed environment. In most flights there is a private first class bar with a broad range of beverages. You will most likely have your own small range of alcohol in your little luxury pod; however it's important to stay modest and avoid getting sloshed. You want to be able to remember the experience and not ruin it by getting ridiculously intoxicated. Some people are rather reclusive and don't wish to mingle more than they have to. It's esteemed that you honor other peoples desires by not forcing them or pushing them to interact with you. If however you are a reclusive person and don't wish to mingle, respect others that want to. Be polite if you're introduced to someone, however it's fine if you tell someone that you would rather be left to your own devices. When talking with any strangers or new friends, it's important to tread lightly in conversation and avoid topics that require responses on political stances and things of that nature. Keep questions light as you get to know other people; you might ask why they are flying, and where they are visiting.
Be very kind to your in-flight attendants. Try to acquaint yourself with others. Smile graciously. Go easy on the alcohol. Be mindful and respectful of others. Tread lightly in conversation.