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:
Republic Airways Holdings
Table title:
Fleet overview
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=2 > Aircraft </th><th colspan=1 rowspan=2 > In Service </th><th colspan=1 rowspan=2 > Orders </th><th colspan=4 rowspan=1 > Passengers </th><th colspan=1 rowspan=2 > Notes </th></tr>
<tr> <th colspan=1 rowspan=1 > F </th><th colspan=1 rowspan=1 > Y+ </th><th colspan=1 rowspan=1 > Y </th><th colspan=1 rowspan=1 > Total </th></tr>
<tr> <td colspan=1 rowspan=1 > Airbus A220-300 </td><td colspan=1 rowspan=1 > 0 </td><td colspan=1 rowspan=1 > 40 </td><td colspan=4 rowspan=1 > TBA </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=3 > Embraer E170 </td><td colspan=1 rowspan=3 > 69 </td><td colspan=1 rowspan=3 > 6 (to be operated for Delta Connection; aircraft being transferred from Compass Airlines beginning April 2017) </td><td colspan=1 rowspan=1 > 9 </td><td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > 56 </td><td colspan=1 rowspan=1 > 69 </td><td colspan=1 rowspan=1 > Operated for American Eagle </td></tr>
<tr> <td colspan=1 rowspan=1 > 9 </td><td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > 48 </td><td colspan=1 rowspan=1 > Operated for Delta Connection </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 </td><td colspan=1 rowspan=1 > 16 </td><td colspan=1 rowspan=1 > 48 </td><td colspan=1 rowspan=1 > 70 </td><td colspan=1 rowspan=1 > Operated for United Express </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=3 > Embraer E175 </td><td colspan=1 rowspan=3 > 116 </td><td colspan=1 rowspan=3 > 12 (to be operated for United Express; deliveries beginning April 2017) </td><td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > 20 </td><td colspan=1 rowspan=1 > 44 </td><td colspan=1 rowspan=1 > 76 </td><td colspan=1 rowspan=1 > Operated for American Eagle </td></tr>
<tr> <td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > 52 </td><td colspan=1 rowspan=1 > 76 </td><td colspan=1 rowspan=1 > Operated for Delta Connection </td></tr>
<tr> <td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > 16 </td><td colspan=1 rowspan=1 > 48 </td><td colspan=1 rowspan=1 > 76 </td><td colspan=1 rowspan=1 > Operated for United Express </td></tr>
<tr> <th colspan=1 rowspan=1 > Total </th><th colspan=1 rowspan=1 > 185 </th><th colspan=1 rowspan=1 > 58 </th><th colspan=5 rowspan=1 >  </th></tr>
</table>
Question:
Which aircraft fleets does Republic Airline operate?
Answer:
Republic Airline operates a fleet of Embraer 170 and Embraer 175 aircrafts.