If you insist...
As
sbm12 said "KVS is generally screen-scraping publicly available websites". So here's a partial list:
(And that's when they work, the website operators frequently put restrictions in place to prevent KVS from screen scraping their data.)
Also, if the *A/*O/BA/CX award searching is important, you can do all that with a great UI, for free at
http://www.awardnexus.com
Multiple GDS & Point-of-Sale (POS) options for more relevant/accurate Availability and Fare data.
Not Exclusive. Not only does ExpertFlyer have a POS option in the Fare Information search, but we have access to 3 different GDSs for Flight Availability, with different POSs. Also, EF allows you to put in
any POS in the Fare Information search. With KVS you are limited to the few supported by the OTA websites it screen scrapes from.
'Always-on' approach: No need to log-in (except for once every 6/12 months when renewing membership); users are never 'logged-out'.
Starting up an application or starting up a web browser... unless you have a Mac or Linux, then you can't run KVS natively, as it's a Windows app.
However, and more importantly, we don't require users to sign up for long term subscriptions, you can use EF only for the months you need, and not have to pay when you don't need it.
Virtuallythere.com, ViewTrip.com, CheckMyTrip.com etc. These are sites that pull PNR's right from the GDS's, run for free by the GDSs.
Maximum Permitted Mileage [MPM]
Minimum Connection Time [MCT]
Not for long... and MPM information is already in Fare Routing Rules. Also coming soon to the Fare Routing Rules, Ticketed Point Deduction information.
Flight Operational Info (With Airline Comments)
Again, not exclusive, we recently made an improvement to show full comments on supported airlines. KVS gets it for free here:
http://thetravelconcern.travelasp.co...ts/tracker.asp
Visa/Immigration/Customs Information (TIMATIC)
KVS gets that for free here:
http://www.staralliance.com/en/servi...sa-and-health/
All that aside, here's another key difference in terms of real-world usefulness. Since ExpertFlyer connects directly to the GDSs we can do things like directly connect to airline host systems. This does things like allow us to access and show inventory
beyond the usual 331 day limit. So by using ExpertFlyer you can see either award/upgrade inventory or regular inventory farther ahead then usual for airlines such as:
AC, AF, AY, AZ, BA, CX, EI, IB, LY, QF, SQ, etc... Just specify the airline as the only airline in the search and we take care of the rest behind the scenes, automatically. Flight Alerts also takes advantage of the increased date range as well.
Then of course there are all the other services that can't be screen scraped, like Seat Alerts, Flight Alerts, the mobile version at mobile.expertflyer.com, as well as the previously mentioned DL and AA upgrade inventory (probably very relevant to you). However we don't expect you to take our word for it, which is why we have a free trial.