Originally Posted by Check Essential

Ok, I gotta agree with that one.

Delta guys should not be bragging about the VNAV on our 737s.
When it comes to VNAV descents, the Smiths FMS on Delta 737NGs is a piece of junk.
It does OK in climbs or down low at low speeds (ie -- approaches). But in a descent from cruise it never seems to get it right. It is highly likely to overspeed the airplane, overshoot the crossing restriction or get 20 knots slow. (or all three)
The Honeywell VNAV on our 757s and 767s is far superior.