*Aggregate score Wales 7-1 Estonia
A first-half Craig Davies hat-trick at the Racecourse helped Wales Under-21 storm into the Uefa Championships with their most emphatic win in 11 years.
Craig Davies (centre) is now set to link up with the senior Wales squad
Leading 2-0 from the first leg of the play-off in Tallinn, Davies increased the lead after just three minutes.
A low shot gave him his second, Arron Davies volleyed the third, then turned provider to set up the hat-trick.
Vladislav Gossev pulled one back for the visitors, before Arron Davies curled in a 20-yard free kick.
Craig Davies became only the third player to score a hat-trick for Wales at this level, emulating John Hartson and Lee Jones.
We will now be playing in the Uefa competition and that will only help players progress further
Wales Under-21 manager Brian Flynn
The result averts Wales' fears of being left without competitive football at this level for two years, instead booking them a place in a group with Israel and Turkey next season.
Craig Davies, Gareth Bale and Andrew Crofts had been called back to play in Wrexham from the senior Wales squad in Spain, having featured against a Basque XI in Bilbao on Sunday.
The trio are now expected to link back up with the senior squad ahead of the friendly with Trinidad & Tobago in Graz, Austria, on Saturday.
Arron Davies and Rhoys Wiggins are also expected to travel, the pair set to make their first appearances in the senior squad.
Senior team manager John Toshack had live updates relayed to him at his San Sebastian HQ by mobile.
He requested an early substitution for Craig Davies, suggesting that the Hellas Verona player could start along with David Cotterill against T&T, Craig Bellamy and Ryan Giggs having withdrawn from the squad.
Wales Under-21 manager Brian Flynn:
"It was the reward for 18 months of hard work, we have looked at so many young players, something like 60 since I took over.
"Craig [Davies] has sometimes been frustrating to watch, but he has skill and we will help him, and them all, to flourish.
"The opportunity is now arising for some of these young players to step up to the plate, that is the carrot for them all.
"They must take the opportunity when it comes along. My success is driven by players going into the senior squad.
"We have brought through a lot very quickly, a real crash course, and you can see several now on the brink and some will certainly play on Saturday against Trinidad.
"Next season we will now be playing in the Uefa competition and that will only help players progress further."
Wales U21: Price, Spender, Wiggins (Bale 67), Crofts (R. Davies 74), Morgan, M. Williams, MacDonald, D. Edwards, C. Davies (D. Williams 52), Calliste, A. Davies.
Booked: R. Davies
Estonia U21: Reelo, Jaager, Post, Klavan, Kruglov, Reinumae, Purje (Kams 45), Vunk (Ahjupera 82), Gussev, Vassiljev, Sidorenkov (Hurt 71).
Booked: Sidorenkov, Jaager, Vunk.
Ref: Gardar Orn Hinriksson