Airline shares soared higher on Monday on another positive development in the race to produce a COVID-19 vaccine, and on data indicating a strong weekend for travel. American Airlines Group (NASDAQ: AAL) led the sector higher, closing up 8.2% for the day. Latest travel data indicated that Americans are slowly returning to the skies ahead of a vaccine. Over 1 million people per day passed through Transportation Security Administration airport checkpoints on both Friday and Sunday, with Sunday's total of 1,047,934 travelers the highest recorded since March. American shares are now up 20% for the month, but still down 52% for the year.