- don't go oohing and aahing over everything like a lovestruck teenager
- don't take too many selfies ... better, don't take ANY selfies
- thank the flight attendants for EVERYTHING they do ... offering to hang your jacket, offering a pre-departure beverage and/or a hot towel (I haven't been in AA F in 20 years, so I don't know what is and isn't commonly done here), bringing and removing the meal tray, refilling your drink, etc
basically, just be pleasant, and enjoy your 3 or 4 hours in the front cabins