Question of the Day: How do you find the cheapest and best flights? Are travel agents still relevant in the 21st century?

WizzairThe way travel agents make money has morphed in the last decade away from commissions on flights. I still book my plane tickets to Europe with a living, breathing travel agent for whom I’m very thankful. Who else still uses a travel agent? Why? For what? And, when it comes to getting a ticket from the USA to Europe, what tips do you have for scoring the best fares? How about tickets for flying within Europe?