A number of carriers have already raised their fourth-quarter guidance this month after strong Thanksgiving travel and December trends, including Southwest Airlines American Airlines JetBlue Airways and Alaska Air That has boosted the sector’s shares. The Transportation Security Administration expects to screen close to 40 million passengers between Dec. 19 and Jan. 2, a 6.2% jump from 2023 levels. The risk of a government shutdown, however, could make things difficult for the TSA.