The cooling of the epidemic has led to good profits in the shipping and tourism industries, while Delta's annual results doubled in 2023, driving record revenues and, in the final quarter, revenue in premium class rose 15 percent during the period, outpacing revenue growth of 10 percent in standard economy class seats.。The company, however, revised down its full-year profit forecast, largely due to rising costs such as fuel and labor, which dragged its shares down 9 percent on Friday and shares of other major airlines.。Investors in shipping stocks are advised to pay close attention to key cost factors such as crude oil prices and wage costs.。