Originally Posted by
Sigwx
That would be the case with a missing panel on the wing to body fairing. The noise difference from gear down to gear up and a clean airframe is quite something isn’t it. You may well have seen 300kts ground speed or indeed true airspeed, however the indicated airspeed would indeed have been below this. At 10,000 feet 250 knots indicated would equate to about 300 knots true airspeed and 10 minutes after take off you would have been at or around this level.
Thanks! Checked my photo and then Flight Aware for fun. Looks like the hold around 250 knots went to 12,700' and then up and out from there .
https://www.flightaware.com/live/fli.../KBOS/tracklog. Wheels up bit before Swindon (per photo) and then shushed up quickly and quietly from there.
Back in the 90's I was on an AA flight from BOS to LHR where one of the door panels was not closed properly (a small one) and we crossed the Atlantic with the vibration and a much slower speed.