With Spirit gone, what could this mean for passenger throughput numbers?

U.S. airline TSA screenings fell year-over-year for all major domestic carriers, with Southwest down 4.6% and Alaska down 6.3%, while Delta and United were down about 2% and American down 1.5%. Airlines are trimming forward capacity, with May schedules cut 0.3% and June by 0.5%, as elevated fuel costs tied to the Iran conflict weigh on fares and demand. The data points to softer summer travel trends and continued consumer resistance to high ticket prices.

Analysis

The key read-through is not “air travel weak,” but that airlines are in a classic margin defense phase: if they are trimming seats into a softening demand backdrop, they are protecting unit revenue at the expense of load factor and network utilization. That usually helps larger, more diversified carriers absorb the shock better than the lowest-cost players, because the fixed-cost deleveraging hits the latter harder when they lose density. The next-order effect is that reduced capacity can temporarily mask demand weakness in pricing, but it also raises the probability of a sharper fare reset later in the summer if bookings do not reaccelerate.

The most vulnerable names are the ones with the least pricing power and the highest exposure to discretionary domestic leisure demand. LUV and ALK look most exposed to a prolonged yield-vs-volume tradeoff, while DAL and UAL should be relatively better insulated if premium cabins and corporate share hold up. AAL is less interesting as a short here because easier comparables can keep the headline metrics from deteriorating as quickly, which makes it a poor clean expression of the weak-demand thesis.

The contrarian point is that the market may be overfocusing on near-term screening data and underestimating the supply response. If capacity keeps getting pulled in May/June, the industry can preserve pricing longer than expected, especially if any competitor exits or network disruptions force incremental demand redistribution. The bigger risk to the bearish view is not a quick demand snapback, but a stabilized fare environment that allows earnings revisions to bottom sooner than the volume data would suggest.

Key Decisions for Investors

• Short LUV vs long DAL for the next 4-8 weeks: best relative expression of weak domestic leisure demand, with downside if fare compression persists and upside if premium/corporate mix holds better than expected.
• Short ALK outright or buy puts dated 1-2 months out: higher sensitivity to demand elasticity and capacity discipline failure; risk/reward improves if forward bookings do not inflect by the next monthly schedule update.
• Avoid making AAL the primary short: easier comps can preserve optics for another quarter, so it is better as a hedge than a standalone bearish catalyst play.
• If playing the sector broadly, use a bearish call spread on JETS/airline ETF rather than outright shorts: allows participation in a later summer fare reset while limiting squeeze risk if capacity cuts stabilize pricing.
• Watch for a tactical long entry in DAL on any 5-7% selloff: relative winner if the market starts to price a bifurcated airline tape, with better defensive characteristics if demand weakness stays concentrated in lower-fare leisure.