The bulls are betting that Boeing gets cleared for takeoff.
OptionMonster's tracking programs detected the purchase of about 10,500 January 90 calls for $1.71 and the sale of an equal number of January 100 calls for $0.52. Volume exceeded the previous open interest at each strike, indicating that these are new positions.
Owning calls locks in the price where a stock can be bought, while selling them obligates a sale at a certain level. In the case of yesterday's bullish call spread, the trader has the right to buy Boeing for $90 and then sell it for $100 if the stock climbs to the higher price. It cost $1.19 to open that $10 spread.