European stock markets relinquished their earlier gains as declines in airline shares offset advances in the media and technology sectors. Investors were simultaneously processing a heavy flow of corporate earnings reports.

The Stoxx 600 index ended the session largely flat, having been up by as much as 0.5% during the trading day. Airline stocks fell after easyJet issued a profit warning, causing its shares to drop as much as 8.8% at one point, marking its largest intraday decline since June 2022. The stock later pared losses to close down 5.0%. Other carriers, including Ryanair and Deutsche Lufthansa, also declined, pulling the Stoxx 600 Travel & Leisure sector into negative territory. This sector emerged as the worst performer within the Stoxx 600 index.

In contrast, the media and technology segments demonstrated strength. CTS Eventim AG and Nemetschek SE both saw gains exceeding 2%.

Investors are seeking further evidence to assess the impact of the conflict in Iran on corporate sales and profits. Companies scheduled to report earnings within the next three weeks represent over 60% of the Stoxx 600 index's total market capitalization. The index currently remains below its pre-conflict level.

"The earnings season is likely to trigger further volatility in European markets," said Emma Wall, Chief Investment Strategist at Hargreaves Lansdown.