Delta Air Lines announced an expansion of its network from Seattle-Tacoma International Airport (SEA), including the introduction of a new daily nonstop flight to Philadelphia International Airport (PHL) commencing on May 7, 2026. This move is aimed at meeting the demand from both corporate and leisure travelers in the Seattle market. In addition to the new Philadelphia route, Delta is also increasing the frequency of its flights to Ontario, California (ONT), and San Jose, California (SJC). The airline's Vice President of Network Planning, Amy Martin, stated that Philadelphia has been a highly requested destination from their corporate customers in Seattle, underscoring the strategic nature of this expansion in one of their key coastal hubs. The announcement comes as Delta continues to focus on strengthening its position in competitive markets and catering to premium travelers.