Booking a flight

M: Yes, I need to book a business-class flight to Athens on the 23rd, returning on the 30th. I'd like to leave in the morning, please.
W: OK, let's see. There's a Trans-World flight leaving at 5:30 a.m. on that date, with a stopover in Rome, and a Green Airways flight that departs at 9:30. That one's direct.
M: OK, I'll take the 5:30. I assume that one's cheaper, because of the stopover?
W: Yes, it is. That one's $434. The direct flight is $535. But if you're able to leave a little later, EuroAir has a special discount on a 1 p.m. direct flight: only $475.