for(REVVY__MnContract__c contract: NewMap.values()) {              
                     if (oldMap.get(contract.Id).ContractStage__c == 'Signature|Completed' && contract.ContractStage__c == 'Booked|In Effect') {
                         if(contract.REVVY__Opportunity__c != null){
                           system.debug('00000000' + contract.REVVY__Opportunity__r.owner );
                        
                           mapContracts.put(contract.REVVY__Opportunity__c, contract);
                         }
                     
                     }
                } 
            // the method is to send an email when MnContract life cycle is activated. We do not activate bulk records at a time
            // so not considering bulk here
          
            acRels = new list<Aircraft_Relationship__c>();              
          
           user OpptyUser = new user();
            if(!mapContracts.isEmpty()) {
            
            Opp = [select id, name,(select id,Date_Ordered__c, Aircraft__r.name, Opportunity__r.name,Aircraft_User__r.name from A_C_Relationships__r),ownerid from opportunity where id =: (mapContracts.keyset())[0]];
           // system.debug('-----0000----' + ContractOpptyIDs);
                   for(Aircraft_Relationship__c acRel: opp.A_C_Relationships__r){
                   acRels.add(acRel);
                  
                }
                system.debug('the no of ac Rel associated to the opp ' + acRelsize.size());
            }
            if(Opp != null){
                OpptyUser = [select id, name, email from User where  id = :opp.ownerid] ;
                EmailTemplate emailTemplates = [select id,name,subject from EmailTemplate 
                where name = 'Contract Stage Activate Notification' and isActive = true and 
                TemplateType = 'visualforce' limit 1];                                            
                system.debug('00000000'+ emailTemplates );