TexasCHLforum.com

JustSomeOldGuy wrote:http://rules-saps.tamu.edu/PDFs/34.06.02.M1.pdfn this case....

The doc says;

Campus - means all land and buildings owned or leased by Texas A&M.

and

3. The open carrying of handguns is prohibited everywhere on campus. Licensed peace
officers are authorized by law to carry firearms at all times.

No 30.07 sign is required to prohibit open carry on a campus, as it is outlawed completely as open carry was never allowed on campus when open carry was originally passed;

http://www.tamu.edu/statements/campus-carry.html wrote:The changes enacted by House Bill 910 (Open Carry) are effective January 1, 2016. However, this law does not permit open carry on a university campus.

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OP is lucky the cop was in a good mood. This is a great example of why prohibited places are silly.

"Easterwood Airport is owned by Texas A&M University (TAMU)."
https://www.flyeasterwood.com/about-us/

So yes, I would guess that "campus carry" would apply, if so then no OC is allowed (campus carry only allows concealed carry not open carry where/when designated by the campus).