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:
Operation Black Buck
Table title:
Summary
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Mission </th><th colspan=1 rowspan=1 > Target </th><th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Primary Vulcan </th><th colspan=1 rowspan=1 > Reserve Vulcan </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > Black Buck 1 </td><td colspan=1 rowspan=1 > Port Stanley Airport runway </td><td colspan=1 rowspan=1 > 30 April–1 May </td><td colspan=1 rowspan=1 > XM598 (Reeve) </td><td colspan=1 rowspan=1 > XM607 (Withers) </td><td colspan=1 rowspan=1 > Performed; primary aircraft cabin failed to pressurise shortly after takeoff, replaced by reserve </td></tr>
<tr> <td colspan=1 rowspan=1 > Black Buck 2 </td><td colspan=1 rowspan=1 > Port Stanley Airport runway </td><td colspan=1 rowspan=1 > 3–4 May </td><td colspan=1 rowspan=1 > XM607 (Reeve) </td><td colspan=1 rowspan=1 > XM598 (Montgomery) </td><td colspan=1 rowspan=1 > Performed </td></tr>
<tr> <td colspan=1 rowspan=1 > Black Buck 3 </td><td colspan=1 rowspan=1 > Port Stanley Airport runway </td><td colspan=1 rowspan=1 > 13 May </td><td class="highlighted"  colspan=1 rowspan=1 > XM607 </td><td class="highlighted"  colspan=1 rowspan=1 > XM612 </td><td colspan=1 rowspan=1 > Cancelled before takeoff due to weather conditions </td></tr>
<tr> <td colspan=1 rowspan=1 > Black Buck 4 </td><td colspan=1 rowspan=1 > Anti-aircraft radar </td><td colspan=1 rowspan=1 > 28 May </td><td colspan=1 rowspan=1 > XM597 (McDougall) </td><td colspan=1 rowspan=1 > XM598 </td><td colspan=1 rowspan=1 > Cancelled 5 hours into flight, due to a fault in the Victor fleet </td></tr>
<tr> <td colspan=1 rowspan=1 > Black Buck 5 </td><td colspan=1 rowspan=1 > Anti-aircraft radar </td><td colspan=1 rowspan=1 > 31 May </td><td colspan=1 rowspan=1 > XM597 (McDougall) </td><td colspan=1 rowspan=1 > XM598 (Montgomery) </td><td colspan=1 rowspan=1 > Performed </td></tr>
<tr> <td colspan=1 rowspan=1 > Black Buck 6 </td><td colspan=1 rowspan=1 > Anti-aircraft radar </td><td colspan=1 rowspan=1 > 3 June </td><td colspan=1 rowspan=1 > XM597 (McDougall) </td><td colspan=1 rowspan=1 > XM598 (Montgomery) </td><td colspan=1 rowspan=1 > Performed; primary aircraft forced to divert to Brazil due to a broken refuelling probe </td></tr>
<tr> <td colspan=1 rowspan=1 > Black Buck 7 </td><td colspan=1 rowspan=1 > Port Stanley Airport stores and aircraft </td><td colspan=1 rowspan=1 > 12 June </td><td colspan=1 rowspan=1 > XM607 (Withers) </td><td colspan=1 rowspan=1 > XM598 (Montgomery) </td><td colspan=1 rowspan=1 > Performed </td></tr>
</table>
Question:
What were the primary and reserve aircraft for the Black Buck 3 mission?
Answer:
Vulcans XM607 and XM612 were designated the primary and reserve aircraft, respectively.