Inquiry on Australia NSW Labor Law] I travel overseas on…

Hello Leon, thank you for taking up the question and responding.To be exact, the policy is over 8 hour flight (one way) only be provided with time in lieu, which I was not aware. I looked into the contact and so far I found below.PUBLIC HOLIDAYS
8.1 I agree that by reason of the nature of ***'s business I may be required by *** to work on a public holiday as defined in holiday legislation applicable to me. If I am either rostered or required to work on a public holiday *** shall pay me at the rate of time and a half for the hours worked.Person specification
Must be flexible to travel within the Region for short periods as and when required and also to work
weekends on a rotation basisHours of Work:
Hours of work will be 37.5 hours per week, based on our standard business hours 8.30am to 5.00pm Monday to Friday. From time to time you may be required to work additional hours as advised by your Manager. As a salaried employee you are not eligible for overtime.Regards,
MO

No other clause as far as I am aware. Does this mean I need to work on weekends whenever the employer request to do so?

I am afraid I do not agree. "Reasonable" should meet the conditions below, and the situation does not meet. I am not entitled to receive overtime, I was not noticed in advance that I had to flight as overtime on weekend.* if the employee is entitled to receive overtime payments or penalty rates for working the extra hours
* if they are paid at a higher rate on the understanding that they work some overtime
* if the employee was given enough notice that they may have to work overtime--------------------------------------------------------------------------------
https://www.fairwork.gov.au/employee-entitlements/hours-of-work-breaks-and-rosters/hours-of-work/when-overtime-applies#2169-2170Reasonable overtimeAn employer can request that an employee works reasonable overtime. Overtime can be reasonable so long as the following things are taken into account:any risk to health and safety from working the extra hours
the employee’s personal situation, including their family responsibilities
the needs of the workplace
if the employee is entitled to receive overtime payments or penalty rates for working the extra hours
if they are paid at a higher rate on the understanding that they work some overtime
if the employee was given enough notice that they may have to work overtime
if the employee has already stated they can’t ever work overtime
the usual patterns of work in the industry.An employee can refuse to work overtime, if the request is unreasonable.
-------------------------------------------------------------------------------I did not get any information that TIL or overtime will not be arranged for the weekend flights nor it was not stated in any contracts I signed. Employer can request to work on weekends without pay or liue whenever/however does not make sense. What if the employer requested to work on all weekends?