15 Two 3

this is for a take home test in my economics class and i can’t figure out the answer…another question i have is: "United Airlines is considering increasing fares on the Syracuse to Chicago route. This route is also served by American Airlines. Assume that United knows its own price elasticity of demand for this route. What other elasticities should it know before enacting the fare increase?

if you can help me with those 2 question i would be extremel thankfull!!!

With internet, people write emails instead of snail mails. This includes season’s greetings. So less snail mails.
On the other hand, more people buy things online through eBay, etc. So more packages and snail mails.