For their respective second quarters of 2013, Royal Caribbean Cruises made the most money with $46 million, compared to $41 million for Carnival Corporation, and a loss of $8 million for Norwegian Cruise Line.

Royal Caribbean made even more on a per passenger day basis with $5.42 compared to $2.21 for Carnival.

For Q2, the numbers changed at the operating income level, with Norwegian posting the highest income of $34.51 per passenger day, compared to $13.36 for Royal Caribbean and $8.18 for Carnival.

And, operating expenses per passenger day were lowest for Norwegian at $152.38, followed by $155.98 for Royal Caribbean and Carnival with $179.00.

Non-operating expenses, however, were highest for Norwegian, at $37.70 per passenger day, which diluted net income. Non-operating expenses for Royal Caribbean was $10.28 and only $5.97 for Carnival.

Norwegian posted the highest gross ticket revenue at $165.50 per passenger day over $161.06 for Royal Caribbean and $140.58 for Carnival.

In addition Norwegian posted the highest onboard revenue per passenger day at $67.60, compared to $60.80 for Royal Caribbean and $45.14 for Carnival.

Net ticket prices came in at $124.71 for Norwegian over $123.76 for Royal Caribbean and $113.36 for Carnival.

Net onboard revenue was $49.76 for Norwegian over $44.23 for Royal Caribbean and $38.95 for Carnival.

Note: Any one quarter can be affected by special events, extraordinary costs and one-time charges as was this past Q2 so this comparison may change for Q3 as well as the full year.