JetBlue won approval to take over Spirit Airlines' slots at New York's LaGuardia airport.
Airport slots are scarce and valuable. Fuel costs remain high, and attacks have hit airports in Saudi Arabia and Russia.
Germany is adding drone detection at its biggest airports.
Airports in the Gulf and Russia have been hit by attacks, raising insurance and security costs for airlines. Cargo flights are running at normal levels.
Airport slots are permissions to take off and land at busy airports at set times. Because the number is limited, they are valuable, and an airline that holds more of them has more control over its routes and fares.
What could change this. Against this: a softer crude price would ease fuel costs quickly for unhedged carriers.
So-what: Airlines with scarce slots gain, while fuel and security costs keep pressure on the industry.
What to watch. Jet fuel; Gulf airport security; slot transfers.