It indicates that the travel agent has only requested a seat, and wait-listing status is a possibility. Avoid consuming the food and drink offered on airplanes. Alcohol, nuts, soft drinks, and other foods that have empty calories can cause a swing from high to low blood sugar. You go from feeling great to feeling tired, cramped, and headachy. Alcohol has more punch during an airplane flight than on the ground.
Body fluids evaporate quickly in the pressurized dry cabin.
And under pressure, the alcohol absorbs more fluids in the intestinal tract, thus making itself felt more quickly.