CANCELED flights, severe weather, and air quality concerns threaten holiday traveling plans as Independence Day approaches. Over 1,900 flights were canceled overnight after thunderstorms blew through New York City and surrounding areas Monday night. The travel chaos comes as the city braces for more wildfire smoke to bring haze and dangerous conditions, New York Governor Kathy Hochul warned. Another severe weather front is expected to come later in the week and could combine with the smoke to create less-than-savory travel conditions. It's expected to bring moderate to severe thunderstorms over parts of states like New York, Pennsylvania, Maryland, and Delaware.