New Delhi, Dec. 4 -- Amid hundreds of flight cancellations and ensuing chaos, IndiGo CEO Pieter Elbers on Friday shot a letter to employees, acknowledging that the airline had failed to live up to its promise to serve customers well and provide a good experience.

"These past few days have been difficult for many of our IndiGo customers and colleagues. We serve close to 380,000 customers a day and want each of them to have a good experience. We could not live up to that promise these past days and we have publicly apologized for that," Elbers said in an internal communication accessed by Hindustan Times.

The IndiGo CEO went on to highlight what issues had led to their failure, saying, "An accumulation of several operational challenges - ...