help needed

hi there

I am hoping that someone on here can help me.

My husbands birthday 40th birthday is in a few months and I was hoping to get him letter/ autographs from well known pilots as a present.

He is an engineer and has a love of classic ww2 planes so I was hoping that I could get stuff in that era.

Does anyone know where I could find websites, emails or addresses and would someone be able to give me some names of people I should look for.

Sorry if this is the wrong forum to post on, I do not know much about avaition.

Thankyou for helping