Just to clarify, Virgin use an ACARS system to calculate the required speeds prior to takeoff. This system is provided to them as a partnership of SAS and Navtech.
It provides a few screens to input data on the MCDU and then it is transmitted to a server by ACARS and then the results are sent back.
The system is also available on the Internet for use in the event ACARS is U/S. It is not a laptop based system.
PT6A (below is a sample from the ACARS)
G-VFOX 08JUL10 22:04 V3.3.6
A340-642
EGLL/27RFULL
000/00 +15C 1013
DRY RUNWAY
RW 3884 CW 77 SW 0
AC-OFF A/I-OFF
SYST OK
CONF 2 FULL THRUST
CLIMB 400.0
OBSTACLE 400.0
FIELD 400.0
STRUCTURAL 368.0
ACT TOW 360.0
MAX FLEX T=48
V1 - 149
VR - 168
V2 - 179
ACCL ALT STD 1600FT
NOTE:
TODC END