Claim: Spanish fans celebrated their World Cup win by waving the Palestinian flag.
Verdict: Correct (85% confidence)
Explanation: According to AVA Press, Spanish fans waved the Palestinian flag during celebrations of their World Cup win, with slogans like 'Free Palestine' being echoed. Al Jazeera also supports this by reporting that Lamine Yamal, a Spanish footballer, was hailed for waving the Palestinian flag, which was part of the celebrations. These sources confirm both the celebration of the World Cup win and the waving of the Palestinian flag, supporting the claim.