OK, Success... sort of.
The flights can be edited in notepad. Just riight click and choose from list etc.
Scroll down the file and find [aircraft.0] and substitute whatever you want. One odd thing for float/amphibians and possibly for all planes in all flights is that things are not always in the same place in FS9 as they were in FS8. To get the same flight you may also need to edit the coordinates.
Here's a sample. Don't forget to pair it with a WX file. This worked fine for me in both installs of FS9
I put the modified FLT & WX files into the Classic Swift folder.
------------
[Main]
Title=Columbia Christmas
Description=The weather outside is frightful... Fly down to Portland and pick up your cousin Sky from Arizona for a Christmas visit.
AppVersion=9.0.30612 //---- I changed but it worked OK with 8.xx
FlightVersion=1
[Tower]
Latitude=N045° 38' 38.6993"
Longitude=W121° 57' 19.1995"
Altitude=+000132.00
[Track]
Latitude=N041° 51' 38.5897"
Longitude=W087° 42' 43.5498"
Altitude=+000131.00
[Options]
Titles=False
Sound=True
Pause=False
AxisIndicator=Off
ATC=False
PropAdvanceSelect=Manual
Moonlight=True
SimSpeed=001.00
ShowStars=True
ApproachLights=False
FlightDisplay=Off
SlewDisplay=Coordinates
[EFIS]
Active=False
Mode=VOR
Type=Rectangles
Density=Thin
Range=Short
NavAid=VOR 1
Altitude=0
Flags=0
[Avionics]
LocalizerSelect=Auto Select
DMESelect=1
[Slew]
Active=False
BankIncrement=0
HeadingIncrement=0
AltitudeIncrement=16384
ForwardIncrement=0
SideIncrement=0
PitchIncrement=16384
[Panels]
Panel.On=True
HUD.On=False
[Window.1]
Order=0
Active=True
Undocked=False
Maximized=True
ScreenUniCoords=0, 0, 8191, 2775
UndocCoords=0, 0, 0, 0
ViewMode=Spot
ViewDir=Forward
CockpitZoom=001.00
VirtualZoom=000.50
TowerZoom=001.00
TrackZoom=004.00
SpotZoom=001.00
MapZoom=011.00
SpotDirection=190.28
SpotDistance=+000120
SpotTransitionType=Fixed
SpotFastTransition=False
SpotAltitude=+000027
PanHeading=360.00
PanPitch=360.00
PanBank=360.00
ChaseTarget=0
[ATC_AgentManager]
Numberof*gents=0
[ATC_Aircraft.0]
AcState=ACSTATE_REQUEST_TAXI_CLEARANCE_OUT_VFR_ATIS
AcTaxi=ACTAXI_NONPROGRESSIVE
AgentTracking=
ActiveVFRAirport=
NumberofWaypoints=0
NumTaxiRoute=0
ClearanceFlags=0
CtCur=CLEARANCE_NONE
WaypointNext=0
AltCleared=-1
HdgAssigned=-1.000000
SquawkAssigned=4608
LandingSequence=LANDING_NONE
DepartureRequest=DEPARTURE_VFR_REQUEST_NONE
ParkingRequest=PARKING_NAME_NONE
PatternLeg=PATTERN_LEG_NONE
RunwayIndex=-1
ParkingIndex=-1
FlightFollowing=FLIGHT_FOLLOWING_NO
AirspaceTransition=AIRSPACE_TRANSITION_NONE
BVAirspaceTransition=BV_TYPE_NONE
BVAirspaceTransitionReq=BV_TYPE_NONE
TaxiRouteCurrent=-1
TakeoffSequence=TAKEOFF_SEQUENCE_NONE
LandingSequenceNumber=-1
DescentStep=-179769313486231570000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.000000
AgentHandoff=
AircraftSignature=1,0
[ATC_AircraftManager]
NumberofAircraft=1
[ATC_MessageSystem]
FrequencyNodes=0
[DateTimeSeason]
Day=359
Year=2001
Hours=15
Minutes=45
Seconds=13
Season=Winter
SimTime=8157.174347
[Panel.1]
ScreenUniCoords=0, 0, 8192, 6144
UndocCoords=0, 0, 0, 0
Visible=False
Undocked=False
HiddenOn=False
ID=0
ViewsOn=1
[Panel.2]
ScreenUniCoords=0, 3687, 8192, 2457
UndocCoords=0, 0, 0, 0
Visible=False
Undocked=False
HiddenOn=False
ID=41
ViewsOn=1
[Panel.3]
ScreenUniCoords=0, 0, 0, 0
UndocCoords=0, 0, 0, 0
Visible=False
Undocked=False
HiddenOn=False
ID=42
ViewsOn=0
[Gauges]
Airspeed=Operative
TurnCoordinator=Operative
DG=Operative
Altimeter=Operative
AI=Operative
VSI=Operative
Comm=Operative
Nav=Operative
Transponder=Operative
ADF=Operative
Compass=Operative
PitotSystem=Operative
VacuumSystem=Operative
Fuel=Operative
Engine=Operative
Electrical=Operative
KollsmanSetting=29.91
PanelLights=False
MaximumGForce=6.106792
MinimumGForce=-0.151555
EngineHours=0.3813269331
[Plane.0]
Aircraft=Globe Swift Amphibian //----This is the one necessary change
[SimVars.0]
Latitude=N045° 38' 38.1700"
Longitude=W121° 57' 19.6456"
Altitude=+000123.68
Pitch=-1.006485
Bank=-0.116203
Heading=155.824491
PVelBodyAxis=0.003779
BVelBodyAxis=-0.004807
HVelBodyAxis=-0.001373
XVelBodyAxis=0.022295
YVelBodyAxis=-0.853312
ZVelBodyAxis=-0.006132
DynPres=0.214985
AGL=4.607957
SimOnGround=True
PAccBodyAxis=0.029324
BAccBodyAxis=-0.032780
HAccBodyAxis=-0.003769
XAccBodyAxis=0.100360
YAccBodyAxis=-1.823216
ZAccBodyAxis=-0.105053
PVelWorld=0.003776
BVelWorld=-0.004783
HVelWorld=-0.001381
XVelWorld=-0.015125
YVelWorld=-0.853332
ZVelWorld=-0.016500
IceAccum=0.000000
AutoFeatherSwitch=False
[Engine Parameters.1.0]
ThrottleLeverPct=0.219147
PropellerLeverPct=1.000000
MixtureLeverPct=1.000000
Pct Engine RPM=-0.068243
LeftMagneto=False
RightMagneto=False
GeneratorSwitch=False
CowlFlapPct=1.000000
FuelPumpSwitch=False
CarbHeat/DeiceSwitch=False
[Engine Parameters.2.0]
ThrottleLeverPct=0.219147
PropellerLeverPct=1.000000
MixtureLeverPct=1.000000
Pct Engine RPM=-0.068243
LeftMagneto=False
RightMagneto=False
GeneratorSwitch=False
CowlFlapPct=1.000000
FuelPumpSwitch=False
CarbHeat/DeiceSwitch=False
[Engine Parameters.3.0]
ThrottleLeverPct=0.000000
PropellerLeverPct=0.000000
MixtureLeverPct=0.000000
Pct Engine RPM=0.000000
LeftMagneto=False
RightMagneto=False
GeneratorSwitch=False
CowlFlapPct=0.000000
FuelPumpSwitch=False
CarbHeat/DeiceSwitch=False
[Engine Parameters.4.0]
ThrottleLeverPct=0.000000
PropellerLeverPct=0.000000
MixtureLeverPct=0.000000
Pct Engine RPM=0.000000
LeftMagneto=False
RightMagneto=False
GeneratorSwitch=False
CowlFlapPct=0.000000
FuelPumpSwitch=False
CarbHeat/DeiceSwitch=False
[Fuel.0]
TankSelector=All
TankSelector1=All
Center=100.000000
LeftMain=80.212631
RightMain=80.212631
LeftAux=100.000000
RightAux=100.000000
LeftTip=100.000000
RightTip=100.000000
Center 2=100.000000
Center 3=100.000000
External 1=100.000000
External 2=100.000000
[Controls.0]
SpoilersHandle=000.00
LeftSpoiler=000.00
RightSpoiler=000.00
FlapsHandle=000.00
LeftFlap=000.00
RightFlap=000.00
GearsHandle=100.00
Gear1=100.00
Gear2=100.00
Gear3=100.00
YokeY=050.00
YokeX=050.00
Rudder=050.00
LeftBrake=000.00
RightBrake=000.00
ParkingBrake=000.00
ElevatorTrim=050.66
RudderTrim=0.000000
AileronTrim=0.000000
[Systems.0]
BatterySwitch=False
AvionicsSwitch=True
StructuralDeiceSwitch=False
PropDeiceSwitch=False
Autobrakes=Off
StandbyVacuum=False
PropSync=False
FlightDirector=False
[Switches.0]
PitotHeat=False
BeaconLights=False
LandingLights=False
LogoLights=False
NavLights=False
PanelLights=False
RecognitionLights=False
StrobeLights=False
TaxiLights=False
WingLights=False
[Avionics.0]
Comm1Active=127.300
Comm1Standby=124.850
Comm2Active=124.850
Comm2Standby=124.850
Nav1Active=110.50
Nav1Standby=113.90
OBS1=360
Nav2Active=113.90
Nav2Standby=113.90
OBS2=360
Transponder=1200
ADFActive=414.000000
ComTransmit=1
ComReceiveBoth=False
AudioNav1Listen=False
AudioNav2Listen=False
AudioMarkerListen=False
AudioDmeListen=False
AudioAdfListen=False
[AutoPilot.0]
MasterSwitch=False
WingLeveler=False
Nav1Lock=False
HeadingLock=False
HeadingValue=360.000000
AltitudeLock=False
AltitudeValue=0.000000
AttitudeHold=False
AirspeedHold=False
AirspeedValue=0.000000
MachHold=False
MachValue=0.000000
VerticalSpeedHold=False
VerticalSpeedValue=0.000000
RPMHold=False
RPMValue=0.000000
GlideslopeHold=False
ApproachHold=False
BackCourseHold=False
YawDamper=False
ToGa=False
AutoThrottleArm=False
GPSdrivesNAV1=False
IsUsedForLesson=False