After TikTok users debated whether or not they should swap seats on a plane, a flight attendant chimed in with what could only be considered an expert opinion. Though travel etiquette usually starts once you’ve landed at your destination, it’s also easy to argue that you should be on your best behavior while traveling on the plane. Thankfully, flight attendants and former captains are on hand to offer advice, as seen recently with the revelation that you should be buying hot drinks. Should you swap seats on the plane, according to a flight attendant Flight attendant Mariah (@hashtagmariah) off…