| Schedule of reconciliation between basic and diluted EPS | A reconciliation between basic and diluted earnings per share was as follows (in thousands, except share and per share data): 
|  |  |  |  |  |  |  |  
|  |  | Three Months Ended  |  
|  |  | March 31,  |  
|  |      | 2025 |      | 2024 |  
| Net income (loss) |  | $ |  (40,295) |  | $ |  17,353 |  
| Basic weighted-average shares outstanding |  |   |  441,147,186 |  |   |  426,803,519 |  
| Dilutive effect of share awards |  |   |  — |  |   |  4,215,687 |  
| Diluted weighted-average shares outstanding |  |   |  441,147,186 |  |   |  431,019,206 |  
| Basic EPS |  | $ |  (0.09) |  | $ |  0.04 |  
| Diluted EPS |  | $ |  (0.09) |  | $ |  0.04 |  | 
| Schedule of reconciliation of adjusted operating income (loss) to net income (loss) before income taxes |  The below table includes our calculation of adjusted operating income, our significant segment expenses therein, and a reconciliation of adjusted operating income to net income (loss) before income taxes (in thousands):  
|  |  |  |  |  |  |  |  
|  |  | Three Months Ended  |  
|  |  | March 31,  |  
|  |      | 2025 |      | 2024 |  
| Total revenue |  | $ |  2,127,553 |  | $ |  2,191,215 |  
| Cruise operating expense |  |  |  |  |  |  |  
| Commissions, transportation and other |  |  |  395,343 |  |  |  436,210 |  
| Onboard and other |  |  |  138,858 |  |  |  132,036 |  
| Adjusted payroll and related (1) |  |  |  329,127 |  |  |  338,948 |  
| Fuel |  |  |  175,014 |  |  |  197,734 |  
| Food |  |  |  75,588 |  |  |  84,708 |  
| Other |  |  |  184,631 |  |  |  192,454 |  
| Adjusted total cruise operating expense |  |  |  1,298,561 |  |  |  1,382,090 |  
| Other operating expense |  |  |  |  |  |  |  
| Adjusted marketing, general and administrative (2) |  |  |  375,919 |  |  |  345,135 |  
| Depreciation and amortization |  |  |  231,297 |  |  |  222,929 |  
| Adjusted total other operating expense |  |  |  607,216 |  |  |  568,064 |  
| Adjusted operating income |  | $ |  221,776 |  | $ |  241,061 |  
|  |  |  |  |  |  |  |  
| Adjusted operating income |  | $ |  221,776 |  | $ |  241,061 |  
| Non-cash compensation (3) |  |  |  (20,834) |  |  |  (22,667) |  
| Interest expense, net |  |  |  (217,872) |  |  |  (218,177) |  
| Other income (expense), net |  |  |  (24,505) |  |  |  18,137 |  
| Net income (loss) before income taxes |  | $ |  (41,435) |  | $ |  18,354 |  
| (1) | Excludes non-cash share-based compensation expenses related to equity awards for shipboard officers (see Note 9 – “Employee Benefits and Compensation Plans”) and non-cash deferred compensation expenses related to the crew pension plan as follows (in thousands): | 
  
|  |  |  |  |  |  |  |  
|  |  | Three Months Ended  |  
|  |  | March 31,  |  
|  |      | 2025 |      | 2024 |  
| Service cost |  | $ |  553 |  | $ |  719 |   
| (2) | Excludes non-cash share-based compensation expenses related to equity awards for corporate employees (see Note 9 – “Employee Benefits and Compensation Plans”). | 
 
| (3) | Includes non-cash deferred compensation expenses related to the crew pension plan and non-cash share-based compensation expenses related to equity awards, which are included in payroll and related expense and marketing, general and administrative expense. | 
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