His employer sponsors the race but Peter Snowden's name might be the one to be indelibly linked to the Darley Crown.

As his career with Darley comes to a close, Snowden won the Group Three fillies and mares races for the fourth time when Aerobatics went back to back at Hawkesbury on Saturday.

Gaining cover from the middle stages of the race, Aerobatics produced the finishing sprint she is renowned for to beat Plucky Belle and Cosmic Endeavour in a drive to the line.

It gave Snowden a Hawkesbury treble from the first five races with the trainer conceding it was a bonus as he prepared to officially hand over the reins at Darley to John O'Shea on Sunday.

"That's three (winners) and I thought coming here if I got one then I would be happy," Snowden said.

In a carbon copy of his 2013 win on Aerobatics, jockey Christian Reith timed his run to perfection to get the mare across the line.

"She is a difficult filly to ride because you've got to get cover on her to switch off," Snowden said.

"She's got ability, she's a very well-bred filly and she has really come of age now but there is a certain way to ride her. Things need to fall right to bring out the best out in her."

Snowden's precision was just as accurate as his jockey's with Aerobatics finding her best form at the fourth run of her campaign.

"It's a race we picked out for her right from the beginning of her preparation and we aimed to have her peaking here," Snowden said.

Kanzan (2011), Serenissima (2010) and Sung (2008) are the other Snowden-trained runners to win the Crown.