By Faisal Islam, Political Editor
The RAF in Akrotiri, Cyprus, now know that they will soon be taking part in airstrikes against IS in northern Iraq.
MPs have voted overwhelmingly in favour of their deployment; 524 Yes and and 43 Noes in favour of the motion.
At first we expect just six Tornados - already being used for surveillance - to be armed and ready for action.
The result came after a creditable, statesmanlike day-long debate.
But there were some political casualties - Shadow Education Minister Rushanara Ali resigned from the front bench, and Iain McKenzie, an aide to Shadow Defence Secretary Vernon Coaker, was sacked, after abstaining and voting against the motion respectively.
MPs voted overwhelmingly for military action In reality there were two debates. A tightly worded formal debate motion on Iraq, and a shadow debate on Syria.
The PM's personal view, expressed in this debate, was: It would be justified and legal to extend action into Syria. And, in a "humanitarian disaster", it might not require an advance parliamentary mandate.
This muddied the waters a little. Number 10 later clarified that this would have to be a "Benghazi" style imminent massacre.
Given that the US and allies are already bombing IS in Syria, it would hardly come as a surprise. But it did not affect the result in Parliament.
George Galloway was a dissenting voice The main vote's thumping majority was by design.
The PM had sought the backing of Ed Miliband in a phone call from the UN in New York on Wednesday.
The motion was accordingly tightly drafted on tactics (no combat troops) and territory (Iraq only).
But it was not just a consequence of Labour caution, the Liberal Democrats too have been a break on this process.
For Labour's part, Mr Miliband suggested that it would be better to get a UN Mandate for any extension of action to Syria.
Back in the chamber the critiques ranged in from different directions: "The mission creep hasn't even waited until the end of the debate," said George Galloway.
Ken Clarke pointed out that the action was basically symbolic, and involved six planes.
Senior Tory backbenchers including Liam Fox and Andrew Mitchell called for a mandate for airstrikes in Syria.
All this debate, the publication of legal advice, and front bench Labour resignations for late entry to just a part of ongoing military action, that would occur regardless.
So the airstrikes start soon, but perhaps the real significance is the cementing of Britain's changed world role.
Iraq's deputy prime minister Saleh al Mutlaq speaks to Sky News
A RAF Tornado GR4 

Labour MP Rushanara Ali immediately resigned after the result was announced
An RAF Tornado GR4 carrying Storm Shadow missiles
Some of the locations in Syria hit by US airstrikes
The US has already been carrying out raids against IS in Iraq and Syria
IS militants have been branded 'psycopathic terrorists' by the PM 
Travis became a household name in the 1970s
Sheikh Omar Bakri Mohammad
Choudary reportedly said he had no sympathy for hostage Alan Henning 
Abu Abrahim says there is no education for children in Raqqa
The US has launched airstrikes against IS targets in Syria
Several Syrian cities and IS strongholds were targetted in the attacks
The group have made rapid advances across swathes of Iraq and Syria
The PM warned of terrorist plots in Britain and the US
Iraq's PM Haider al Abadi is likely to ask for Britain's help to defeat IS
Iran's President Hassan Rouhani will also hold talks with Mr Cameron
UK hostage Alan Henning is being held by the group. Pic: Cage
Also on the agenda with be Iran's nuclear-enrichment programme
A Tomahawk missile is launched from USS Arleigh Burke
Where the airstrikes took place in Syria
Saudia Arabia, UAE, Jordan, Bahrain and Qatar were involved in the raids
A fighter jet takes off from USS George H W Bush
Islamic State have made rapid gains in Iraq and Syria
A second video of UK hostage John Cantlie has been released by IS
The aircraft was hit by a Patriot missile
A file picture of the type of jet that was shot down 
Tesco shares have fallen more than 40% in the last year 
Tesco CEO Dave Lewis (l) and UK managing director Chris Bush (r)
Tesco shares are now worth less than they were 10 years ago
Mr Balls says a cap in child benefit rises will save £400m
A 5% cut in ministerial salaries is also on the cards
Mr Henning (L) had driven an ambulance full of food and water to Syria