Per your article, there have been several ground crew strikes that have cost DL and AF millions in damages.
Large parts of KLM's Amsterdam ground crew have staged several
strikes in the past weeks to demand higher wages and better working conditions, leading to hundreds of cancellations.
"This has played a large role in the op decision by Delta and Air France," KLM spokesperson Anoesjka Aspeslagh said.
"They have incurred millions of euros in damages and had to let down many of their customers."
A court has ordered that future strikes affect only KL and not their international partners.