In a Safety Alert for Operators (SAFO) bulletin issued January 29, 2017, the FAA is calling for all pilots and flightcrew operating near the boundaries of Class B airspace to exercise caution and be aware of the risk of excursions out of and incursions into Class B airspace. According to the SAFO, all pilots and flightcrew should utilize published resources to become familiar with the vertical and lateral boundaries of Class B airspace they may be operating in or near. For more information, see the entire SAFO here.