High costs are expected to have hurt American Airlines' (AAL) Q4 performance. The adversity is likely to have been partly offset by improved air-travel demand.
### Instruction: What is the sentiment of this news? Please choose an answer from {negative/neutral/positive}
### Input: High costs are expected to have hurt American Airlines' (AAL) Q4 performance. The adversity is likely to have been partly offset by improved air-travel demand.
### Response: mildly negative