Crossbench independents Allegra Spender, Helen Haines and Kate Chaney have declared they are pulling out of the elite lounges run by Qantas and Virgin, amid the ongoing spotlight on privileges politicians receive from the airlines.

Allegra Spender, the member for the Sydney seat of Wentworth, also said she’d write to ask Qantas and Virgin not to give free upgrades to parliamentarians. It was “time to end the upgrades”.

She said all sides of politics enjoyed the perks, and both major parties had blocked greater competition from Qatar Airways.

Airlines operated under government policy and ministerial decisions, she said. “The public is understandably losing trust in politicians to make those decisions impartially when they’re being given free upgrades from the companies they’re supposed to regulate.”

Spender urged a review of the ministerial code of conduct. Tighter rules were needed about what politicians could accept. The code should also be extended to shadow ministers. There should as well be much more transparency over the diaries of ministers, she said.

“This is the only way to deal with the perception – and potential reality – of decisions being influenced by perks.”

But Labor MP Luke Gosling, from the Darwin seat of Solomon, accused her of grandstanding. “It’s a bit rich from the people with harbour views who either drive or have less than a one-hour flight,” he told the ABC.

Haines, from the Victorian regional seat of Indi, said she was quitting the lounges because she wanted “to remove any possibility of an actual or perceived conflict of interest” in her work as an MP.

“The reality that airlines offer these kinds of perks because ultimately they want to get something in return does not sit well with me and I want to continue to contribute to creating a culture of transparency and accountability through my actions as well as my words.”

Haines said she wanted “to see more rigorous rules around MP disclosures of upgrades and I think a ban on soliciting free flight upgrades is more than reasonable”.

Chaney, who holds the Western Australian seat of Curtin, said with the media attention on the issue “we need to do everything we can to rebuild trust in politicians making decisions in the public interest”.

Another crossbencher, Monique Ryan, from the Melbourne seat of Kooyong, who dropped her Qantas chairman’s lounge membership last year on integrity grounds, said she welcomed the discussion about the impact of corporate largesse on MPs’ decision-making.

“I am deeply concerned about lobbying and its potential to impact government decision making. Free upgrades and airline hospitality are lobbying practices that we have taken for granted for a long time, and it is important that we re-examine them — especially given public concerns about conflicts of interest.”

Meanwhile there is no indication of when opposition transport spokeswoman Bridget McKenzie, who was leading the charge against the prime minister over his upgrades, will produce a list of her own. She has said she has written to three airlines to check what upgrades she has had.