Are you putting this in a Heredoc syntax, or ar you just outputting one big echo statement? It's hard to tell since you only gave a snippet.
So, if you are outputting one big echo, then concatenate your variables.
<tr>
<td align=\"left\"><span class=\"smBold\">Air travel requested?</span></td>
<td align=\"left\">".$air_requested."</td>
</tr>
<tr>
<td align=\"left\"><span class=\"smBold\">Air CC/CTA#:</td>
<td align=\"left\">".$air_cc."</td>
</tr>
If you are using HEREDOC, then embrace your variables.
<tr>
<td align=\"left\"><span class=\"smBold\">Air travel requested?</span></td>
<td align=\"left\">{$air_requested}</td>
</tr>
<tr>
<td align=\"left\"><span class=\"smBold\">Air CC/CTA#:</td>
<td align=\"left\">{$air_cc}</td>
</tr>
If you're stuff isn't enclosed in php at all, then do that...
<tr>
<td align="left"><span class="smBold">Air travel requested?</span></td>
<td align="left"><?php echo $air_requested; ?></td>
</tr>
<tr>
<td align="left"><span class="smBold">Air CC/CTA#:</td>
<td align="left"><?php echo $air_cc; ?></td>
</tr>
If none of these work for you, then post all of the code from the processing page, so we can see what you are doing.