A “significant” airplane delay is now defined: three hours for domestic flights and six hours for international flights. One of several pro-customer changes coming for U.S. airlines.

Automatic Refunds and No More Hidden Fees: D.O.T. Sets New Rules for Airlines
The Transportation Department issued new requirements on refunds when flights are canceled or delayed and on revealing “junk” fees before booking. Here’s what passengers can expect.
nytimes.com
