It's Not Your Imagination. Airlines Are Padding Flight Times.
Briefly

Despite longer average flight times from Kennedy Airport to LAX, the percentage of on-time arrivals has improved significantly since 1995, due to extended schedules.
The average flight from J.F.K. to LAX now takes 18 minutes longer than in 1995, yet flights arriving late have decreased from 51 percent to just 37 percent.
Airlines have adjusted their scheduled flight durations upwardly, allowing more flights to arrive on time or early, despite longer actual travel times.
The average scheduled flight duration has increased by 23 minutes since 1995, leading to a trend where planes that arrive on time are actually slower than before.
Read at www.nytimes.com
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