1 converts written data into sound waves. 2  converts the sound waves from a voice into a digital signal. 3  converts letters from the keyboard into digital format. 4  converts digital sound waves into analog sound waves.
Travel agencies make their money in a variety of ways. The products agents sell have built-in fees that result in a profit for the agency. The amount of the fees and the ways in which they are earned and distributed differ by the type of product sold and the suppliers who provide that product to the agency.
Travel Agent Do Not Cost More-Travel agents basically earn their living by the commissions we earn from our sales of hotel stays, cruises, sightseeing and rental cars. The airlines haven't paid commissions to travel agents since the mid 1990's.