A nacelle (100; 200; 300), comprising: an inlet (102; 202; 302; 402); a fan cowl (104; 204; 304; 404) aft of the inlet (102; 202; 302; 402), the fan cowl (104; 204; 304; 404) including a fan cowl panel (104a; 104b; 204a; 304a; 404) configured to rotate between an open position and a closed position; and a first securement retainer (140;240; 340; 440) including a first portion (142; 242; 342; 444) coupled to an interior surface (146; 246; 346; 446) of the fan cowl panel (104a; 104b; 204a; 304a; 404) and a second portion (144; 244; 344; 442), wherein the first portion (142; 242; 342; 444) of the first securement retainer (140;240; 340; 440) extends radially inward from the interior surface (146; 246; 346; 446) of the fan cowl panel (104a; 104b; 204a; 304a; 404), wherein the first portion (142; 242; 342; 444) is configured to engage the second portion (144; 244; 344; 442); wherein: the inlet (102; 202; 302; 402) includes an aft inlet flange (152; 252; 352; 452) comprising: a fan cowl interface portion (154; 254; 354; 454); and a retainer land (150; 250; 350; 450) radially inward of the fan cowl interface portion (154; 254; 354; 454); characterised in that: the aft flange (152; 252; 352; 452) comprises a connection portion (156; 256; 356) extending radially between the fan cowl interface portion (154; 254; 354; 454) and the retainer land (150; 250; 350; 450); and the second portion (144; 244; 344; 442) of the first securement retainer is coupled to the retainer land (150; 250; 350; 450) of the aft inlet flange (152; 252; 352; 452) and extends radially outward from the retainer land (150; 250; 350; 450). an inlet (102; 202; 302; 402); a fan cowl (104; 204; 304; 404) aft of the inlet (102; 202; 302; 402), the fan cowl (104; 204; 304; 404) including a fan cowl panel (104a; 104b; 204a; 304a; 404) configured to rotate between an open position and a closed position; and a first securement retainer (140;240; 340; 440) including a first portion (142; 242; 342; 444) coupled to an interior surface (146; 246; 346; 446) of the fan cowl panel (104a; 104b; 204a; 304a; 404) and a second portion (144; 244; 344; 442), wherein the first portion (142; 242; 342; 444) of the first securement retainer (140;240; 340; 440) extends radially inward from the interior surface (146; 246; 346; 446) of the fan cowl panel (104a; 104b; 204a; 304a; 404), wherein the first portion (142; 242; 342; 444) is configured to engage the second portion (144; 244; 344; 442); wherein: the inlet (102; 202; 302; 402) includes an aft inlet flange (152; 252; 352; 452) comprising: a fan cowl interface portion (154; 254; 354; 454); and a retainer land (150; 250; 350; 450) radially inward of the fan cowl interface portion (154; 254; 354; 454); characterised in that: the aft flange (152; 252; 352; 452) comprises a connection portion (156; 256; 356) extending radially between the fan cowl interface portion (154; 254; 354; 454) and the retainer land (150; 250; 350; 450); and the second portion (144; 244; 344; 442) of the first securement retainer is coupled to the retainer land (150; 250; 350; 450) of the aft inlet flange (152; 252; 352; 452) and extends radially outward from the retainer land (150; 250; 350; 450). the inlet (102; 202; 302; 402) includes an aft inlet flange (152; 252; 352; 452) comprising: a fan cowl interface portion (154; 254; 354; 454); and a retainer land (150; 250; 350; 450) radially inward of the fan cowl interface portion (154; 254; 354; 454); a fan cowl interface portion (154; 254; 354; 454); and a retainer land (150; 250; 350; 450) radially inward of the fan cowl interface portion (154; 254; 354; 454); characterised in that: the aft flange (152; 252; 352; 452) comprises a connection portion (156; 256; 356) extending radially between the fan cowl interface portion (154; 254; 354; 454) and the retainer land (150; 250; 350; 450); and the second portion (144; 244; 344; 442) of the first securement retainer is coupled to the retainer land (150; 250; 350; 450) of the aft inlet flange (152; 252; 352; 452) and extends radially outward from the retainer land (150; 250; 350; 450). the aft flange (152; 252; 352; 452) comprises a connection portion (156; 256; 356) extending radially between the fan cowl interface portion (154; 254; 354; 454) and the retainer land (150; 250; 350; 450); and the second portion (144; 244; 344; 442) of the first securement retainer is coupled to the retainer land (150; 250; 350; 450) of the aft inlet flange (152; 252; 352; 452) and extends radially outward from the retainer land (150; 250; 350; 450).