Canberra Airport has been lit up in rainbow colours to greet federal MPs flying into the capital, ahead of the introduction of a cross-party bill to support gay marriage expected this fortnight.

And Australian Marriage Equality's new national campaign slogan, #WeCanDoThis, is also on display with hopes the momentum in the community for same-sex marriage will lead to change within weeks.

Rainbow colours and marriage equality signage during a preview on Friday. Credit:Alex Ellinghausen

High-profile Australians, including AFL players Josh Bruce and Matt Spangher, actor Hugo Weaving and television news reader Chris Bath are featuring in ads to be broadcast from Sunday, calling on Parliament to stop stalling on the issue.

The Snow family, which owns and operates Canberra's airport, have become the latest businesspeople to join more than 500 organisations in urging Parliament to endorse marriage equality once and for all.