After some experimentation, very happy with 2oz Sipsmith; 1/2oz each of lemon juice and Luxardo Maraschino, and 1/4 oz of Tempus Fugit Liqueur De Violettes. The only downside is the pink rather than blue hue ....
After some further experimentation, purely in the interest of science, I've increased the lemon juice to 3/4 oz, with the others remaining in place. So, 2 oz Sipsmith, 1/2 oz Luxardo Maraschino, 1/4 oz Rothman & Winter Creme de Violette, and 3/4 oz lemon juice. It now seems a bit more complex and slightly less sweet.
I notice you reduced the Maraschino and creme de violette and added the simple syrup in the past month or so. I'm curious what led you to make the adaptation?
I mention this in my comment under the recipe but I have expanded this to show my own recipe and explain why (please see above). I retried my Aviation while working through all cocktail Hall of Fame recipes. It jumped out as not as harmonious as I remembered, hence the change. Be good to know your thoughts?
Dizzying array of Aviation recipes/variations out there - our own take at home is fairly sturdy, in part to suit the modern trend for somewhat oversize glassware:
2 oz Gin - (we use Tanqueray 10)
3/4 oz Luxardo
1/2 oz lemon juice
1/4 oz creme de violette
1/4 oz St. Germain (our secret ingredient)
cherry garnish
We have never seen one made that is as purple-hued and clear as some of the photos found online - mb
Just tried your recipe and it's tasty. A tad sweeter but I really like the floral elderflower notes. Back in 2006, I went down a similar route with my Elder Aviator.