b$.$ You may find it easier to complete Question $($a$)$ before this question. Create a stored procedure that takes a desired arrival airport code, departure airport code, luggage limit$,$ class $($economy $\text{'}$E$\text{'},$ business $\text{'}$B$\text{'}$ or first class $\text{'}$F$\text{'})$ and desired number of seats as input and prints out the flight number $(\text{'}$NE$\text{'}$ followed by the last $3$ digits of the flight ID$)$ of all flights that are available for booking that will travel between the specified airports. As in Question $($a$),$ the procedure should check whether there are enough seats available in the desired class, whether there is enough luggage room $($after subtracting mail cargo capacity from the total cargo capacity$),$ and whether each flight is estimated to depart at least $3$ hours from the time that the stored procedure is executed. Hint: It may help to use the SUBSTR function.