The Angel of the North and the Baltic Centre were lit up by campaigners protesting against British Airways' plans to cut 12,000 jobs during Covid-19.
The landmarks were lit up with the words ' British Airways stop betraying Britain' in a major wide campaign on Friday by campaigning group Unite.
Unite claimed the company served BA workers with a Section 188 notice which "effectively sacks 42,000 workers to bring the workers back on considerably worse terms and conditions," and slammed plans to cut 12,000 jobs.
The group claimed British Airways were "betraying Britain" and were using Covid-19 as "cover."
However BA say they are working to protect "as many jobs possible".
Unite general secretary Len McCluskey has written to members of the board of IAG copied to Willie Walsh, IAG CEO and Luis Gallego Martín, Chairman and CEO of Iberia.
In the letter, Mr McCluskey writes: "I have no option but to do all I can to protect my members and shine a light on your betrayal of Britain and your cynical use of this crisis as cover for your corporate greed.
"In the first stages, I have authorised a multifaceted campaign in defence of our members. This as you may know means that we will ensure that the public, customers, businesses and all other stakeholders, will be made aware of your deplorable actions and the detail of how you as a company have acted in this crisis.
"All interested parties will be engaged by all and any means possible and I am sure that many will make decisions in light of your actions."
British Airways has a call centre based in Newcastle, with hundreds of pilots and cabin crew living in the North East.
Unite general secretary Len McCluskey said: "Unite has tried to engage constructively with British Airways. If BA are not trying to use this crisis for corporate gain, then why has the company not agreed to come to the table to seek temporary measures until revenue returns?
"BA's plan to use the worst health crisis in a century to strip loyal workers of their terms and conditions is a betrayal of workers and of Britain.
"We are launching a major public campaign to alert BA's customers, shareholders and partners, both in Britain and internationally, of the severe and permanent damage being done at a time of national crisis."
BA said in a statement: “We are acting now to protect as many jobs possible.
“The airline industry is facing the deepest structural change in its history, as well as facing a severely weakened global economy.
“We are committed to consulting openly with our unions and our people as we prepare for a new future.”
