Customers flying a few of Delta’s transcon flights between LAX and New York’s JFK Airport Saturday took to social media as the airline celebrated what would be Frank Sinatra’s 100th birthday with a special surprise and delight experience.

To honor the influential singer and actor, flight attendants served a special tasting of Jack Daniels’ ultra-premium, limited run whiskey, Sinatra Century to customers of age. Delta One customers received a commemorative shot glass to go with the tasting and all month, the airline has been featuring the Frank’s Way signature cocktail—two fingers of Jack Daniels Old No. 7, ice and a splash of water—just the way Sinatra liked.

Travel and lifestyle online magazine Pursuitist also highlighted the event.

“Shoutout to @Delta for celebrating Frank Sinatra’s bday with free shots of whiskey. #toastsinatra” wrote MTV News contributor Madeline Roth via Twitter.

As part of a month-long activation, Delta has featured dedicated Frank Sinatra playlists on personal in-flight entertainment as well as feature films, documentaries and concerts. Where possible, customers were welcomed on board and settled into their seats listening to some of Sinatra’s most famous tunes.

shoutout to @Delta for celebrating frank sinatra's bday with free shots of whiskey. #toastsinatra pic.twitter.com/Q1yOM3a7LM

— Madeline Roth (@madfitzroth) December 13, 2015

Customer Service #WIN - good job, @Delta, for passing out @JackDaniels_US Sinatra Century in memory of him on his b-day! Thanks!

— Matthew Ruffi (@mruffi) December 12, 2015