Revenge is a dish best served cold — just like revenge travel, which seems to be cooling off.

After a years-long recovery for the airline industry, which saw sky-high airfare prices and record travel demand, the post-pandemic travel boom is starting to wane. Airlines are now warning shareholders about the challenges they face.

Ground hold: Despite American airports being busier than ever, the surge in travelers hasn’t been all good for airlines. In recent weeks, carriers like UnitedUAL

, AlaskaALK

, and DeltaDAL

have narrowed their earnings outlook and cautioned that “overcapacity” on domestic routes is costing airlines during the peak travel season.

• Airlines have reported that a “fare war” is driving ticket prices down and hurting profits — stemming from an influx of new seats on the market.
• United’s CEO Scott Kirby mentioned that airlines are “trimming their schedules” to reduce flights, which United hopes will help stabilize fare cuts.

When the Grass Isn’t Greener

In the US, airfares have dipped 5% compared to last year — a development that might thrill travelers but unsettle investors. And the situation across the Atlantic isn’t any brighter. Oddo BHF analysts, in a note downgrading Europe’s largest airlines, observed that “the vigorous post-COVID recovery in global demand is now running out of steam.”

• Yesterday, Europe’s largest airline, RyanairRYAAY
  , reported a 46% decline in profits and warned that it expects “materially lower” airfares during peak summer travel.
• Even major events like the Paris Olympics and a record €800B in projected spending from international tourists in Europe this year have done little to help airlines like Air France-KLMAFLYY
  and LufthansaDLAKY
  , down 41% and 25% year-to-date.

Technical turbulence: Making matters worse, the fare war and shifting consumer behaviors aren’t the only hurdles they have to face. Last week’s CrowdStrikeCRWD

outage left airlines with hours-long delays and technical headaches. Although most airlines have recovered, Delta’s troubles extended into Monday, with nearly one-third of its Friday and Saturday flights canceled and over 5.5K flights canceled since the outage began. Delta now faces the added burden of reimbursing customers for accommodations and alternative travel, which could further impact its already wavering profits.