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Be punctual. Exercise humility. Thank your first class host.
It's important to be as poised as you can at all times. Show that you can be well-revered by practicing punctuality upon arrival and also when it's time to board. Understand that it will be relaxed in the luxury lounge, and your host or concierge will remind you prior to being escorted to your seat on the flight.  Avoid doing thing's like showering or ordering big meals only prior to boarding. If you have a big stop-over or waiting time, you may have adequate time to do these things. Fend to be ready to go at least 30-45 minutes before the expected boarding time. Understand that holding up people when boarding is actually holding up the entire airline from Economy to First Class. Because you will be the first group boarding and settling in, it's important to show respect by being where you need to be at the right time so thing's run smoothly and you can get to your destination on-time. There is no need to rush, you have a verified seat on the plane, so show humility by letting other first class passengers board or seat before you. This is a sign of respect and implies that you are a person with a dignified nature. Before you depart on the next leg of your journey, it's important to say farewell and thank your host from the first class lounge, you may never see them again. If you feel so inclined, you could tip them for their service as a sign of your appreciation before they hand you over to your next porter.