my $url = "http://www2.germanwings.com/";    
$a->get( $url );
$a->submit_form
(
'form_name' => 'SBform', 
'fields'	=> 
.....
)
my $inp = $a->content();
....
....
print "<a href='../cgi-bin/gertest.pl?p=$inp'>buchen</a>";
....