Using the online/web form, parser cannot resolve 'vista.aero'.
Here the tracking URL:
http://www.spamcop.net/sc?id=z2198810004zf...2e7bf087feb85dz

Hmm - indeed it can't. Maybe the TLD is throwing the parser or maybe the deputies just don't want reports to go. I see:

C:\Documents and Settings\Steve>nslookup vista.aero
...
Non-authoritative answer:
Name: vista.aero
Address: 82.94.224.146

C:\Documents and Settings\Steve>whosip -r 82.94.224.146

WHOIS Source: RIPE NCC
IP Address: 82.94.224.146
Country: Netherlands
Network Name: XS4ALL-CUST-484557
Owner Name: Lemontree
From IP: 82.94.224.144
To IP: 82.94.224.151
Allocated: Yes
Contact Name: XS4ALL Internet NOC
Address: XS4ALL Internet BV, Postbus 1848, 1000BV Amsterdam, The Netherland
s
Email: netmaster[at]xs4all.nl
Abuse Email: abuse[at]xs4all.nl
Phone: +31 20 3987654
Fax: +31 20 3987604


WHOIS Record:
% This is the RIPE Whois query server #3.
% The objects are in RPSL format.
%
% Rights restricted by copyright.
% See http://www.ripe.net/db/copyright.html

% Information related to '82.94.224.144 - 82.94.224.151'

inetnum: 82.94.224.144 - 82.94.224.151
netname: XS4ALL-CUST-484557
descr: Lemontree
country: NL
admin-c: XS42-RIPE
tech-c: XS42-RIPE
status: ASSIGNED PA
remarks: Please send email to "abuse[at]xs4all.nl" for complaints
remarks: regarding portscans, DoS attacks and spam.
...

Perhaps you should email the deputies (deputies[at]admin.spamcop.net, subject like "Routing for vista.aero [82.94.224.146]") and suggest abuse[at]xs4all.nl - if you agree with that resolution.

Apparently Resolved;

Resolving link obfuscation
http://vista.aero
Host vista.aero (checking ip) = 82.94.224.146
host 82.94.224.146 (getting name) no name
Host vista.aero (checking ip) = 82.94.224.146
host 82.94.224.146 (getting name) no name

Tracking link: http://vista.aero/
[report history]
Resolves to 82.94.224.146
Routing details for 82.94.224.146
[refresh/show] Cached whois for 82.94.224.146 : abuse[at]xs4all.nl
Using abuse net on abuse[at]xs4all.nl
abuse net xs4all.nl = abuse[at]xs4all.nl
Using best contacts abuse[at]xs4all.nl

On the other hand, see http://bink.nu/news/bink-nu-presents-get-a...ro-address.aspx .. allegedly announcing a 'great new service' .... yet the front page http://vista.aero/ seems to include (currently) a bit of a list of complaints about the current spam run.