United Airlines is pushing back the return of dozens of Boeing 777 jets until at least May 13, according to a note sent to pilots, which was seen by CNBC.
### Instruction: What is the sentiment of this news? Please choose an answer from {negative/neutral/positive}
### Input: United Airlines is pushing back the return of dozens of Boeing 777 jets until at least May 13, according to a note sent to pilots, which was seen by CNBC.
### Response: strong negative