Carnival Corp. /zigman2/quotes/202325446/composite CCL -4.43% said Friday it was cancelling more cruises, as it extends the suspension of U.S. cruises through April 30. That matches cruise suspensions of fellow cruise operators Royal Caribbean Group /zigman2/quotes/208854639/composite RCL -3.04% and Norwegian Cruise Line Holdings Ltd. /zigman2/quotes/204183397/composite NCLH -0.69% announced earlier this month. Carnival said it has also cancelled European cruises for its Carnival Legend ship for departures through Oct. 31, and delayed the start date for Mardi Gras to Port Canaveral to May 29. In addition, Carnival said it cancelled all Australian operations through May 19. Carnival's stock, which fell 1.7% in premarket trading, has run up 36.5% over the past three months through Thursday, while the S&P 500 /zigman2/quotes/210599714/realtime SPX -1.34% has gained 11.6%.