Delta Air Lines CEO Ed Bastian said in a memo on Friday that he continues to expect that the company will achieve positive cash flow by the spring.

In his new year note to employees, Bastian said that company will likely "experience two distinct phases during the next 12 months." The first phase will be similar to 2020, he said.

 "The second phase will begin only when we reach a turning point with widely available vaccinations that spur a significant return to travel, particularly business travel."