Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of South African airports by passenger movements
Table title:
2012–13
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Rank </th><th colspan=1 rowspan=1 > Airport </th><th colspan=1 rowspan=1 > Location </th><th colspan=1 rowspan=1 > Code (IATA/ICAO) </th><th colspan=1 rowspan=1 > Total passengers </th><th colspan=1 rowspan=1 > Rank Change </th><th colspan=1 rowspan=1 > % Change </th></tr>
<tr> <td colspan=1 rowspan=1 > 1. </td><td class="highlighted"  colspan=1 rowspan=1 > OR Tambo International Airport </td><td class="highlighted"  colspan=1 rowspan=1 > Johannesburg, Gauteng </td><td colspan=1 rowspan=1 > JNB/FAOR </td><td colspan=1 rowspan=1 > 18,621,259 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 2.01% </td></tr>
<tr> <td colspan=1 rowspan=1 > 2. </td><td class="highlighted"  colspan=1 rowspan=1 > Cape Town International Airport </td><td colspan=1 rowspan=1 > Cape Town, Western Cape </td><td colspan=1 rowspan=1 > CPT/FACT </td><td colspan=1 rowspan=1 > 8,434,799 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1.65% </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 3. </td><td class="highlighted"  colspan=1 rowspan=1 > King Shaka International Airport </td><td colspan=1 rowspan=1 > Durban, KwaZulu-Natal </td><td colspan=1 rowspan=1 > DUR/FALE </td><td colspan=1 rowspan=1 > 4,668,467 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 7.37% </td></tr>
<tr> <td colspan=1 rowspan=1 > 4. </td><td colspan=1 rowspan=1 > Port Elizabeth Airport </td><td colspan=1 rowspan=1 > Port Elizabeth, Eastern Cape </td><td colspan=1 rowspan=1 > PLZ/FAPE </td><td colspan=1 rowspan=1 > 1,311,553 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 3.91% </td></tr>
<tr> <td colspan=1 rowspan=1 > 5. </td><td colspan=1 rowspan=1 > East London Airport </td><td colspan=1 rowspan=1 > East London, Eastern Cape </td><td colspan=1 rowspan=1 > ELS/FAEL </td><td colspan=1 rowspan=1 > 644,520 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 5.43% </td></tr>
<tr> <td colspan=1 rowspan=1 > 6. </td><td colspan=1 rowspan=1 > George Airport </td><td colspan=1 rowspan=1 > George, Western Cape </td><td colspan=1 rowspan=1 > GRJ/FAGG </td><td colspan=1 rowspan=1 > 544,306 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 5.47% </td></tr>
<tr> <td colspan=1 rowspan=1 > 7. </td><td colspan=1 rowspan=1 > Bloemfontein Airport </td><td colspan=1 rowspan=1 > Bloemfontein, Free State </td><td colspan=1 rowspan=1 > BFN/FABL </td><td colspan=1 rowspan=1 > 411,655 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 6.86% </td></tr>
<tr> <td colspan=1 rowspan=1 > 8. </td><td colspan=1 rowspan=1 > Kimberley Airport </td><td colspan=1 rowspan=1 > Kimberley, Northern Cape </td><td colspan=1 rowspan=1 > KIM/FAKM </td><td colspan=1 rowspan=1 > 151,405 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 7.95% </td></tr>
<tr> <td colspan=1 rowspan=1 > 9. </td><td colspan=1 rowspan=1 > Upington Airport </td><td colspan=1 rowspan=1 > Upington, Northern Cape </td><td colspan=1 rowspan=1 > UTN/FAUP </td><td colspan=1 rowspan=1 > 55,726 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 6.7% </td></tr>
</table>
Question:
What are the three busiest airports in South Africa?
Answer:
The KSIA is the third busiest airport in South Africa, behind both OR Tambo International Airport in Johannesburg and Cape Town International Airport.