Airline booking application are available in many a number and the competition in this business segment is very stiff, where one can quickly and easily compare rates from different airlines to find the best deal for our next flight. With an intuitive search engine, one can enter their travel dates and destination to get a list of available flights and their associated prices. Assume that you are assigned a task to develop a new Airline ticket finding application that will query different airlines for rates and return the daily rate in ascending order. One of your team members went ahead and

implemented the following: $1.$ The application program that will allow

him to list the names of Airlines and the prices $($in ascending order$)$ is written separately. $2.$ An AirlinesRateFinder class queries four Airline classes $($Air India, British Airways, Cathy Pacific, Emirates, Lufthansa$)$ for availability of dates and the rates.

$3.$Each Airline has a method that returns the daily rate $($don$\text{'}$t worry about dates of reservation for this problems$).$

Using this initial design given draw a class diagram for the problem in such a way that if we introduce a new Airline, your new application will require minimal or no change to code. $[8-$Marks$]$