== References for source material for 421 Flight article == 

 Mattbryantuk 

 I'd like to say that this is an excellently written article, and from the degree of specialist knowledge I have about it, it should score highly on accuracy.  Would it be possible please for you to cite your source material in References and Citations?  It seems that if you don't, there's a danger that the article will be removed, which would be a great pity.  The only other source material I'm aware of for 421 Flight is a lengthy and well-researched article in Aviation News in October 1984, a copy of which I have in my possession but I haven't had time at present to go back to this and add anything from it. 

 Regards,