The biggest concern has been over post-Brexit bilateral rules that would require airlines to have substantial US or British ownership
May has embarked on a nationwide campaign to sell sceptical Britons on the EU divorce arrangement she secured in Brussels last weekend
All leaders had taken the conscious decision not to talk about the possibility of a 'plan B'
Opinions on how the court will approach the case -- and its potential impact -- differ widely
May's next task is to take the deal back to London and try to get it through a vote in Parliament
UK PM, who hopes to seal the deal in Brussels today, faces a daunting challenge winning parliament support, members of her own cabinet and EU diplomats are secretly working on "plan B" proposals
A weak pound drives up costs
Ever since winning the top job in the turmoil that followed the 2016 referendum, May has sought to negotiate a Brexit deal that ensures that the United Kingdom leaves in the smoothest way possible
A timeline of events on Britain's struggle with Brexit
The crisis is a grave one for May, who knew even before the resignations that she would struggle to win Parliamentary approval for her draft agreement
The politics of getting the deal through parliament are immensely fraught and the EU is hanging on a positive answer
The inevitable consequence is that at some point there has to be a confrontation between those two stances
Currently, inside the EU, banks and insurers in Britain enjoy unfettered access to customers across the bloc in all financial activities
She said that her team had a "long, detailed and impassioned debate", at the end of which they agreed to move ahead with the deal on the table
Britain is due to leave the EU on March 29, 2019
Until a Brexit deal is completed, it is impossible to know what terms of trade will be negotiated at the WTO
The march comes after another tumultuous week for UK Prime Minister Theresa May in which she failed to agree a divorce deal with EU leaders in Brussels
Britain is due to leave the EU on March 29, 2019, less than three years since Britons voted for an exit in a referendum
May has dismissed the EU's previous suggestion of keeping Northern Ireland aligned to its trade rules as a safety net, or a so-called "backstop" arrangement, saying this would divide the UK
A weekend of intense negotiations - including a surprise dash by Brexit Secretary Dominic Raab to meet his EU counterpart Michel Barnier in Brussels - failed to break the deadlock