The bike-sharing program rewards users who help redistribute bikes around New York City. A few riders have figured out how to turn that into profit.

A New York Times article Thursday highlighted a lucrative side hustle that is emblematic of the times we live in: gaming algorithms to earn money. In this case, folks figured out they could maximize the payout from Lyft’s Citibike “bike angels” program by taking advantage of a company algorithm used to meet its supply-and-demand needs.

A few savvy New Yorkers have figured out how to game a Citi Bike program that rewards members who help move bikes to locations with low inventory—to the tune of thousands of dollars every month. While the side hustle requires a lot of time,

American has been working with banks and card networks on a new deal with the aim of consolidating its business with a single issuer, sources tell CNBC.

American Airlines (NASDAQ:AAL) is reportedly in talks to make Citigroup (NYSE:C) the carrier’s exclusive credit card provider, pushing out rival Barclays (NYSE:BCS) which also has a relationship with the carrier thanks to its legacy deal with the former US Airways.