I was just thinking of planes of a similar vintage to our starting ones, or others that have made only limited or minimal appearances in the Ace Combat series. In some cases, it's because they're experimental or unproduced prototypes, but I'll put my list below, with links if possible. I'm just making suggestion of course, and mainly putting a 'wish list' of planes that are kind of obscure in media, but still have had a long background history of service. I'm not even recommending they all be flyable either. 

In no real order:

[url=http://en.wikipedia.org/wiki/A-7_Corsair_II]A-7 Corsair II (And the proposed modernised Corsair of the late 80's, the YA-7F Strikfighter)[/url]
[url=http://en.wikipedia.org/wiki/Vought_F-8_Crusader]F-8 Crusader (and the Super-Crusader!)[/url]
[URL=http://en.wikipedia.org/wiki/SEPECAT_Jaguar]SEPECAT Jaguar[/URL]
[url=http://en.wikipedia.org/wiki/English_Electric_Lightning]English Electric Lightning II[/url]
[url=http://en.wikipedia.org/wiki/Dassault/Dornier_Alpha_Jet]Alpha Jet[/url]
[URL=http://en.wikipedia.org/wiki/AMX_International_AMX]AMX[/URL]
[url=http://en.wikipedia.org/wiki/Blackburn_Buccaneer]Buccaneer[/url]
[URL=http://en.wikipedia.org/wiki/MiG-23]MiG-23/27 Flogger[/URL]
[url=http://en.wikipedia.org/wiki/Aero_L-39_Albatros]L-39/L-59/L-159 Albatros[/url]
[URL=http://en.wikipedia.org/wiki/Ching_Kuo]AIDC F-CK-1 Ching-Kuo[/URL]
[URL=http://en.wikipedia.org/wiki/KAI_T-50_Golden_Eagle]KAI T-50 Golden Eagle[/URL]
[URL=http://en.wikipedia.org/wiki/Viggen]Saab Viggen[/URL]
[URL=http://en.wikipedia.org/wiki/Dassault_Mirage_F1]Mirage F1[/URL]
[URL=http://en.wikipedia.org/wiki/Super_Etendard]Super Etendard[/URL]
[URL=http://en.wikipedia.org/wiki/General_Dynamics_F-111]F-111 Aardvark[/URL]
[URL=http://en.wikipedia.org/wiki/North_American_A-5_Vigilante]A-5 Vigilante[/URL]
[URL=http://en.wikipedia.org/wiki/S-3_Viking]S-3 Viking[/URL]
[URL=http://en.wikipedia.org/wiki/IAI_Lavi]IAI Lavi[/URL]
[URL=http://en.wikipedia.org/wiki/BAE_Hawk]BAe Hawk[/URL]
[url=http://en.wikipedia.org/wiki/BAC_TSR-2]TSR-2 [/url]
[url=http://en.wikipedia.org/wiki/Avro_Canada_CF-105_Arrow]Avro Arrow[/url]

That list got longer than I expected... and I had to take some things off it... >.<;;