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:
Air Saint-Pierre
Table title:
Historical fleet
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Aircraft </th><th colspan=1 rowspan=1 > Number </th><th colspan=1 rowspan=1 > Period </th></tr>
<tr> <td colspan=1 rowspan=1 > ATR 42-320 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1994–2009 </td></tr>
<tr> <td colspan=1 rowspan=1 > ATR 42-500 </td><td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > 2009–present </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Beechcraft Model 18 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1971–? </td></tr>
<tr> <td colspan=1 rowspan=1 > Douglas DC-3 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1974–76 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Hawker Siddeley HS 748 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1976–1995 </td></tr>
<tr> <td colspan=1 rowspan=1 > Piper PA-23 Aztec </td><td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > 1966–? </td></tr>
<tr> <td colspan=1 rowspan=1 > Piper PA-31-350 Chieftain </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1981–2003 </td></tr>
<tr> <td colspan=1 rowspan=1 > Reims-Cessna F406 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 2003–present </td></tr>
</table>
Question:
What are two airplanes that were used by Air Saint-Pierre in the past?
Answer:
The Air Saint-Pierre used Beechcraft Model 18 and Hawker Siddeley HS 748.