The objective of this study was to evaluate the effect of L. buchneri 30139 (LB), alone or with L. plantarum 40027 (MTD/1) (LP, Volac Intl. Ltd., Hertfordshire, UK), with and without air stress during storage, on the aerobic stability of high-moisture corn (HMC). HMC (68% DM) was (a) untreated (C), or treated with (b) LB - 400,000 log cfu/g of fresh weight), or c) LB and LP - 100,000 cfu/g (LBLP). Five individually replicated silos (7.5 L) for each treatment were packed (density of 653 kg DM/m³) and ensiled for 30 and 90 d between 21 and 23°C. Additional silos for untreated (C-AS) and treated silage with LB (LB-AS) were prepared and air-stressed before the 90-d opening only. Air-stressed silos had 3 1.60-cm holes plugged with stoppers, 2 located on the bottom of the bucket and one on the lid of the bucket. Stoppers were opened for 2 h/every 2 wk through 42 d and then 2 h/wk through 90 d of storage. Each day was analyzed separately using the Fit Model procedure in JMP (SAS Institute Inc., Cary, NC) as a completely randomized block. Significance was declared at P < 0.05. LB and LBLP had fewer yeasts (<2.00 log cfu/g) than C at 30 (5.46 log cfu/g) and 90 d (4.83 log cfu/g) of ensiling. At 90 d C-AS had the highest numbers of yeasts (6.23 log cfu/g) among treatments. Yeasts were <2.00 log cfu/g in LB-AS at 90 d. At 30 d there was a difference in molds between C (3.79 log cfu/g) and LB and LBLP (both <2.00 log cfu/g) but molds were not different among treatments at 90 d. At 30 d, aerobic stability was improved equally by LB (>250 h) and LBLP (>250 h) when compared with C (32 h). At 90 d, aerobic stability was also improved for LB (242 h) and LBLP (>250 h) compared with C (52 h). Air stressed resulted in a decrease in stability (25 h) compared with C (52 h) but stability was still >250 h for LB-AS. Treatment with LB improved the aerobic stability of HMC when added alone or in combination with LP. Air stress during storage decreased the aerobic stability of HMC but it did not affect the stability of silage treated with LB.