The flu, like a cold, is a respiratory infection but is caused by an entirely different group of viruses - namely the influenza A, B and C viruses. Perhaps the best way to prevent the flu is to get an annual flu shot before the flu season hits.
I called Lufthansa, and they told me that there are Economy Plus seating sections on the Bangalore to Frankfurt and Frankfurt to Chicago legs. But, since I bought tickets through United, they told me I can't get any seat assignments until check-in in Bangalore unless I work with United.
Following an industry trend, United Airlines confirmed it will begin retrofitting some of its Boeing 777 aircraft to add an additional seat in each economy class row. The current 777 economy class configuration has nine seats abreast, with five seats between the aisles and two seats on the window sides of each aisle.