To redirect just those 3 URLs (with variable ticket number) on the support subdomain then you can do something like the following before the WordPress front-controller (assuming the support subdomain resolves to the same place and is probably handled by WP) using mod_rewrite, in the root .htaccess file:
RewriteCond %{HTTP_HOST} ^support\.example\.com [NC]
RewriteRule ^((?:a/)?ticket/\d+)?$ https://support.example1.com/$0 [R=302,L]
Change to a 301 (permanent) redirect only when you are sure it’s working OK.
Note that this doesn’t specifically redirect HTTP to HTTPS.