I haven't lost anyone I knew closely in a flying accident but a group of us keenly miss a very good friend who died unexpectedly in sad circumstances this time last year. It's remarkable - and of great credit to him - that his friends never meet without some mention of him, usually starting "do you remember..." followed by laughter as the stories are retold. Gone but remembered with great warmth. You may not forget the circumstances but focus on the friendship and laughter and the sadness will be overcome by the good memories.