This airline is grateful for his extensive contributions and we will miss his friendship and support. We extend our deepest sympathies to the Casey family on its personal loss.

This quote is expressing a sentiment of sympathy to a family who recently lost somebody close to them. In this case, it is likely referring to a person who was part of the airline business and had made major contributions to it. The airline is expressing how much they appreciated this person and will miss their friendship and support. They are expressing their deepest sympathies for the family’s loss and sharing their condolences.