Nope...... a ditch, bail, capture, crash, killed are ALL deaths for the K/D ratio. You have to land.
Technically it's really kills vs land ratio.
Unless something changed along the way the scoring of the game weighed the results differently. A "death" was 1 while, ditch, bail, capture were all different fractions of 1 death when factoring K/D. I don't recall the values but a "ditch" hurt the ratio less than a "capture" and I think "bail" was in the middle somewhere.
That's how it used to be at least, it could have changed somewhere along the line and I missed it.
*edit*
I also kind of liked the old system, occasionally I'd find some poor guy who bailed out and hit the chute at 20k. His/her only recourse was to either wait the hours it would take to get to the ground, beg for a mercy kill on channel 1 (it was available in MA's back then), or ALT+F4 and re-log. My guess is that this is was the reason the change was made. It was one of those one time mistakes that just about everyone made at some point.