United States Estimated flight

Why is this flight estimated? I thought the entire US was in FA’s service area? flightaware.com/live/flight/PDT4383

Piedmont has cloaking devices on some of their Dash-8’s.

The tracks disappear for a while, probably due to whiteout conditions aloft, and speed couldn’t be measured.
That or sometime after March 31, 2014 EST will become EDT…
Could also explain why this one:
flightaware.com/live/flight/UPS2958
had a guessed-at start and ended upset…

Oh. Well. I coulda sworn I heard the cloaking device thing…

Does that mean after March 31 it will become an estimated departure today rather than estimated slinky tomorrow?

Only for the day after March 31.