Airspace rules around KBRO and Mexican airspace
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I recently flew my family to Brownsville TX KBRO for a beach vacation in my 206.  The airport is as far south as you can go in Texas and surrounded on three sides by Mexico.  Threshold to boarder distances are 2.5 to 4 miles.  I filed IFR and was able to arrive and depart on runway 13, making sure I made a tight turn northbound upon departure so all was good.   What surprised me was that the RNAV 31 approach has its IAF, IF and FAF all well inside Mexico.  Are there special rules for operating in this area that allow overflight of the border?  

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I know that at El Paso (ELP), when Rwy 4 is active, you can shoot the LOC/DME 4 (which is mostly in Mexico including the IAF/IF/FAF) without any special paperwork or filing.  However, it's only available for one pass/full stop, not for multiple practice approaches.  I would guess the same is true of BRO's RNAV 31, but a call to the TRACON at 361-299-4230 should confirm/deny that.