Why isn't Apache recognizing my VirtualHosts ServerName?

I am trying to reconstruct a server from backups after a hardware crash. Rather than restore the entire image, I'm trying a combination of installing software and then restoring configuration files from backups. But Apache2 doesn't seem to be honouring the "ServerName" directives in my /etc/apache2/sites-enabled/* files. /server-info shows that it's picking up the right configuration, but it's not displaying my sites, just the default index page in /var/www/html/index.html. Here's a snippet from /server-info:

Module Name: core.c
Content handlers: yes

...

Current Configuration:
In file: /etc/apache2/apache2.conf
  57: LockFile /var/lock/apache2/accept.lock
  66: PidFile /var/run/apache2.pid
  71: Timeout 300
 107: MaxRequestsPerChild 0
 136: AccessFileName .htaccess

 156: DefaultType text/plain
 167: HostnameLookups Off
 175: ErrorLog /var/log/apache2/error.log
 182: LogLevel warn
In file: /etc/apache2/mods-enabled/alias.conf
  17: 
  18:   Options Indexes MultiViews
  19:   AllowOverride None
    : 
In file: /etc/apache2/ports.conf

   8: NameVirtualHost *:80
In file: /etc/apache2/conf.d/security
  27: ServerTokens Full
  38: ServerSignature On
  49: TraceEnable On
In file: /etc/apache2/conf.d/servername
   1: ServerName xen1.xcski.com
   2: ServerAdmin ptomblin@xcski.com
   4: ServerSignature EMail
In file: /etc/apache2/sites-enabled/000-default

   1: 
   2:   ServerAdmin ptomblin@xcski.com
   4:   DocumentRoot /var/www/html
   5:   
   6:     Options FollowSymLinks
   7:     AllowOverride None
    :   
   9:   
  10:     Options Indexes FollowSymLinks MultiViews
  11:     AllowOverride None

    :   
  17:   
  18:     AllowOverride None
  19:     Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
    :   
  80:   ErrorLog /var/log/apache2/error.log
  84:   LogLevel warn
  87:   ServerSignature EMail
    : 
In file: /etc/apache2/sites-enabled/rochesterflyingclub.com

   2: 
   3:   ServerName rochesterflyingclub.com
   4:   ServerAlias www.rochesterflyingclub.com
   5:   ServerAdmin webmaster@rochesterflyingclub.com
   7:   DocumentRoot /www/rochesterflyingclub.com/www
   8:   
   9:     Options FollowSymLinks
  10:     AllowOverride None
    :   
  12:   

  13:     Options Indexes FollowSymLinks MultiViews Includes
  15:     AllowOverride FileInfo AuthConfig Limit
    :   
  20:   
  21:     AllowOverride None
  22:     Options ExecCGI -MultiViews +SymLinksIfOwnerMatch
    :   
  27:   ErrorLog /var/log/apache2/error.log
  31:   LogLevel warn
  34:   ServerSignature EMail

    : 

Answer

Either take :80 off the first or repeat it for all elements. I think the most specific address definition has precedence