Canberra Airport has ramped up its security measures in the past month.
A spokeswoman declined to release details of the increased measures but said the tweak was "not in response to anything in particular" and was not expected to slow travellers.
"People should always allow sufficient time to arrive and comfortably board flights, but passengers are unlikely to experience any extra delays as a result of the additional measures," she said.
An airport spokesman said on September 19 there were no additional security measures in place. The comment came a week after the government announced the national terror threat level had been raised.
News of the changes came as the federal opposition prepared to query the government on resources for the air marshal program which places armed Australian Federal Police officers on chosen flights.
Opposition justice spokesman David Feeney said the opposition had not been briefed on funding for the marshals, known as air security officers.
"It is my hope that recent funding increases for counter terrorism measures will undo the damage of the 2014 federal budget," he said.
"In particular, the government needs to assure us that there is adequate resources for our air security officers program, and they need to reverse their decision to remove all AFP personnel from Hobart International Airport."
Mr Feeney said the issues would be raised in Senate estimates hearings this week.
The opposition is concerned the lack of an AFP presence at Hobart Airport left passengers "more vulnerable to criminal activity".
In the budget the government announced it would save $15 million on AFP costs by having security at Hobart airport provided by Tasmanian police.
Then-shadow attorney-general George Brandis caused a stir in 2011 when he referred to an AFP memo which said funding was to be cut by $16.5 million across four years. Senator Brandis had referred at the time to there being 110 air security officers in 2009.
Air security officers are described by the AFP as specially trained officers who provide an "intelligence-led deterrence and containment capability on selected Australian domestic and international flights to safeguard Australian registered aircraft against in-flight attack".
The government announced an additional $630 million counter-terrorism funding across the next four years for agencies which included the AFP.
A Virgin Australia spokeswoman said the company had robust security measures in place both on the ground and in the air.
A Qantas spokeswoman said the company's security processes met and in many cases exceeded regulatory requirements.
The Sunday Canberra Times understands passengers can expect to see an increased presence of Australian Federal Police at airports across the nation and an increase in security arrangements at terminals.
A government spokeswoman would not comment on the officers, but said the new funding meant Customs and Border Protection had counter-terrorism unit teams across eight major airports.
"They will proactively intervene in suspicious situations or intercept suspicious persons of national security interest in customs controlled areas," she said.
"The additional funding will [also] provide a further nine airline liaison officer positions."
Correction: An earlier version of this article incorrectly said Canberra Airport was one of eighyt major airports with a counter-terrorism team. It is not.
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