What is the sentiment of this news? Please choose an answer from {strong negative/moderately negative/mildly negative/neutral/mildly positive/moderately positive/strong positive}.

Shares of airline companies, including American Airlines Group Inc (NASDAQ: AAL), Delta Air Lines, Inc. (NYSE: DAL) and United Airlines Holdings Inc (NASDAQ: UAL), are all trading lower as the Russia-Ukraine conflict causes geopolitical uncertainty, which could weigh on travel demand.
mildly negative