Give your Lear 45 a parking code using the AF2 editor. Read the Readme that comes with AF2.

It reads in part:

"Parking codes allow you to assign gates to specific airlines or other designated aircraft. This requires matching codes to be entered in the aircraft.cfg file for the aircraft you want parking at those gates. Multiple codes can be entered in this field separated by commas or spaces to specify other airlines that may also use the parking space if it is available. You can type codes directly into this box if you know them already, or you can use the Selection List to look up a code holder by name and insert the code. It is best to use ICAO airline codes where possible in order to maintain a common standard. See Parking Assignments for AI Aircraft for more details

For aircraft, parking codes are designated by inserting a line such as "atc_parking_codes=AAL" in the aircraft.cfg file, but you can use the Aircraft Editor window under the Tools menu to insert codes for aircraft without having to hand-edit files.

Codes are not limited to airlines, you can use them to assign business jet parking, flying school parking, or military unit parking, as just a few examples.  The Parking Specs file has a few pre-defined generic military and GA classes (beginning with ‘Military’ and ‘GA’), but can also make up your own codes such as "F-16" or "C-17" for example.

37. Aircraft Editor
The Aircraft Editor window, called from the Tools menu, allows you to adjust all the parking related parameters for aircraft you have installed.  These parameters are stored in the aircraft.cfg files and .mdl files. Here are the controls on that window:

Aircraft List This displays all the aircraft models you have installed and all variations (paint schemes or airlines) for those aircraft.  You can sort the list, for example to show all Air France aircraft together, by clicking on the column headers.

Parking Code Selector This allows you to select a parking code based on the name of the airline, or other aviation group. The code for the selected list entry will be inserted in the Parking Code box.  You can also type a code directly into the code box.  If you enter a code directly in the box then the selector list will show the airline for that code, so it  acts as a reverse-lookup.
Parking Code Enter a parking code (e.g. AAL for American Airlines) in this box to designate which parking spots the aircraft should use. The aircraft will use parking spots with matching codes in preference to others.  This corresponds to the parameter "atc_parking_codes=" in the aircraft.cfg file "

After using the AF2 Editor, one's aircraft.cfg may look like this:

{fltsim.X}  // replace french braces with ] braces and replace the X with the next number in  sequence
title=F-15C Eagle 1
sim=F-15C Eagle
model=
panel=
sound=
texture=ak19th
checklists=
description=F-15C Eagle Air Superiority Fighter; etc.,
ui_manufacturer=Boeing (McDonnell Douglas)
ui_type=F15
ui_variation=F-19th Eagle Lakenheath
atc_heavy=0
atc_id=Spear6
atc_airline=air force
atc_flight_number=148


red part automatically added by AF2 editor

reference cited: AFCAD Readme file (reprinted here in part for educational purposes only)

bill