There is basically only one thing you need to know to be able to plan a flight with twin babies (defined: under 2 years old). There are only FOUR oxygen masks per row on a plane. When I say ‘row’ I am not including any aisles. So even though “Row 14” may have 6 seats, for the purposes of this information, “Row 14” has a “left 3” and “right 3” side (“2 rows”). The flight attendants will only allow 4 people to sit in a row, including lap infants in the total. So if you’re traveling with twins by yourself,…